ACCUPLACER. Testing & Study Guide. Prepared by the Admissions Office Staff and General Education Faculty Draft: January 2011


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1 ACCUPLACER Testing & Study Guide Prepared by the Admissions Office Staff and General Education Faculty Draft: January 2011 Thank you to Johnston Community College staff for giving permission to revise and adapt their study guide. A special thanks to Professor Fred White for his leadership on this project.
2 Contents ACCUPLACER Testing Information General Test Taking Tips... 4 Elementary Algebra Overview Practice Questions Answers Arithmetic Overview Practice Questions Reading Overview Practice Questions Answers Sentence Skills Overview Practice Questions Answers Accuplacer Essay Writing Overview Additional Resources References
3 ACCUPLACER Testing Information What is the ACCUPLACER? The ACCUPLACER is an assessment test that assesses your level of skill and readiness for a certain educational course path. At Goodwin College, the ACCUPLACER is used as a part of the admissions process to determine your level of readiness for collegelevel courses in the areas of English and math. A student taking the assessment will be tested on math, reading, and English. The test has the following characteristics: Computer based Multiple choice Nontimed Computer adaptive or based on your level of ability How does ACCUPLACER work? The ACCUPLACER is a nontimed, computerized multiple choice test that is taken on a computer. The test presents one question per test screen with a set of answer choices. After choosing your answer, the test will immediately move to the next question. The ACCUPLACER grades each question after it is answered. Therefore, once you have answered a question and moved on to the next question, you will not be able to go back and change your answer. The test is also computer adaptive, meaning that the test administers questions based on how you are performing on each question. This allows ACCUPLACER to accurately score and provide a placement based on your results. You are required to take all parts of the placement test as part of Goodwin College s admissions process if you are enrolling in a degree or diploma curriculum program, ACCUPLACER Test Setup At Goodwin College, students take the following sections: Elementary Algebra, Arithmetic (score dependent), Reading Comprehension, and Sentence Skills (English). Below is a breakdown of the sections: Elementary Algebra Arithmetic Reading Comprehension Sentence Skills 12 questions 17 questions 20 questions 20 questions The ACCUPLACER is graded on a scale of Because the test helps determine whether you are ready for collegelevel courses, a student cannot pass or fail the examination. Depending on how you score, you may be required to take developmental course to help prepare you for collegelevel courses. 2
4 When do I take ACCUPLACER? You will take the ACCUPLACER as part of the admission s process. Your admissions officer will work with you to schedule the test. Your scores will be available immediately after you completed the test. Those scores will be used to determine your first semester schedule. You may use this study guide to study for the test, and you may use additional resources available from the college website. You can also Google: ACCUPLACER online sample questions or algebraic review questions, etc. Test Waiver (Students to not need to take the test): You are not required to take ACCUPLACER if one of the following are met: If you already earned college credit for a transferable English composition and a mathematics course higher than elementary Algebra (e.g., earned a C or better). If you have at least a fouryear degree from an accredited college and can provide an official transcript. If you have a recent, documented SAT Writing or Critical Reading score of 450, then you do not have to take the ACCUPLACER and may be placed directly into English 101. Students with a recent documented SAT Math score 500 do not have to take the Math/Algebra ACCUPLACER and can be placed directly into a college level math course such as Math 125, Math 130 or Math 135. SAT SCORES ARE GOOD FOR THREE YEARS. Please have an official copy of your scores from these tests sent to Goodwin College s admissions office. For courses taken at another college, have your transcripts sent to the Goodwin College admissions office. What should you expect? Before the test, you will need a written testing slip signed by your admissions officer. Then you will need to proceed to the library and sign in. The library staff will provide you with any additional instructors needed to start the test. You may not bring any of the following items into the library: Food, Formulas, Notes, Calculator, Textbooks, Electronic Devices: Mp3 players, IPods, Bluetooth devices, laptops, digital cameras, headphones **If you bring a cell phone, you will be asked to turn it off during testing** After the test, the results are available immediately. The next step is for you to work with your admissions officer or academic advisor to select your first semester of classes. 3
5 General Test Taking Tips Relax! The ACCUPLACER was designed to help you succeed in school. Your score helps you and your advisor to determine which courses are most appropriate for your current level of knowledge and skills. Once you identify your academic strengths and needs, you will get the help you need to improve underdeveloped skills before they can interfere with your learning. Know what items you can and cannot bring with you. To avoid experiencing test anxiety, approach the test with a positive attitude. Negative selftalk can ruin your ability to do well on a test. You will be able to concentrate better on the test if you get plenty of rest and eat properly prior to testing. You should give you self some time to find the testing area, bathrooms, etc. and to gather your thoughts before the test begins. Listen carefully to all pretest instructors prior to starting your test. Carefully read all test questions and instructions presented. Utilize materials given during the test such as scratch paper. Deal with test anxiety by preparing in advance, taking your time, and pacing yourself throughout the assessment. During testing, read the entire question and all choices before attempting to answer. The ACCUPLACER is a multiple choice test. For multiple choice questions, eliminate choices that you know are incorrect first. Then attempt to find and choose the answer. If you are unsure of the answer, make an educated guess. Usually your first choice of the answer is the right one. Don t second guess yourself. Now that you have an idea of what the test is and how it works, take some time to review some of the sample questions provided in this study guide. 4
6 Elementary Algebra Overview Overview The Elementary Algebra section of ACCUPLACER contains 12 multiple choice Algebra questions that are similar to material seen in a PreAlgebra or Algebra I precollege course. A calculator is provided by the computer on questions where its use would be beneficial. On other questions, solving the problem using scratch paper may be necessary. Expect to see the following concepts covered on this portion of the test: Operations with integers and rational numbers, computation with integers and negative rationals, absolute values, and ordering. Operations with algebraic expressions that must be solved using simple formulas and expressions, adding and subtracting monomials and polynomials, multiplying and dividing monomials and polynomials, positive rational roots and exponents, simplifying algebraic fractions, and factoring. Operations that require solving equations, inequalities, and word problems, solving linear equations and inequalities, using factoring to solve quadratic equations, solving word problems and written phrases using algebraic concepts, and geometric reasoning and graphing. Testing Tips DO NOT attempt to only solve problems in your head. Start the solving process by writing down the formula or mathematic rule associated with solving the particular problem. Put your answer back into the original problem to confirm that your answer is correct. Make an educated guess if you are unsure of the answer. Algebra Tips Test takers should be familiar with the following concepts. For specific practice exercises using these concepts, please utilize the resources listed at the end of this guide. Understanding a number line Add, subtract, multiply, and divide negative numbers Exponents Square roots Order of Operations Understanding algebraic terms and expressions Using parentheses Absolute value Combining like terms Simplifying algebraic expressions Multiplying binomials Using proportions to solve problems Evaluating formulas Solving equations (+, , x, ) Solving linear equations 5
7 PRACTICE QUESTIONS Order of Operations Evaluate: (5) (4 5) 2 Simplify: 4. 3 (2x + 2) x 5. 4x x 6. 2 (x 2) 5 (3x 4) Scientific Notation Convert the following expanded form to scientific notation Convert the following scientific notation to expanded form X Simplify. Write answers in scientific notation. 9. (3 x 10 3 ) (5 x 10 6 ) x x 10 4 Substitution Find each value if x = 3, y = 4, and z = xyz 4z 12. 5x z xy 6
8 Operations with Negative Numbers Evaluate: (20) ( 32) (3) (6) (6) 19. (2) (15) 20. (2) (1) (2) (1) (2) (2) (1) 21. (81) /3 14 5/6 24. (3 1/3) (2 2/5) 25. (3.2) (50.7) Exponents Evaluate: Simplify: 30. x 2 x 3 x x x y 3 x 3 y x 6 y 5 7
9 Formulas 32. Solve PV = nrt for T. 33. Solve y = hx + 4x for x. Word Problems 34. One number is 5 more than twice another number. The sum of the numbers is 35. Find the numbers. 35. John was twice Bill s age in the year Their combined age in 2010 is 71. How old were John and Bill in 2000? Inequalities Solve and graph on the number line x (x 4) (x + 1) < 12 Linear Equations in One Variable Solve the following for x: 38. 6x 48 = x (3x + 2) = (3x + 4) 2 (6x 2) = x 2 = x 2 =  4 Multiplying Simple 1st degree Binomials Simplify the following: 43. (x + 5) (x + 7) 44. (2x 3) (4x + 2) 45. (6x + 6) (4x 7) 46. (3x 8) (2x + 9) 8
10 Factoring Factor out the following polynomials: 47. x 2 + 5x x 4 4y x y y + 36 Exponents and Polynomials Simplify and write answers with only POSITIVE exponents: 51. (3x 2 5x 6) + (5x 2 + 4x + 4) x 4 32x x 2 8x (5a + 6) x 3 3x 2 x 5 2x 5 3x x 2 5x 5 Quadratic Equations Solve for the variable, which will have two solutions: 56. 4a 2 + 9a +2 = (3x + 2) 2 = 16 Rational Expressions Perform the following operations and simplify where possible. If given an equation, solve for the variable a = 5 2a 2 a 2  a x 2 x2 2x 8 x 2 + 2x 8 4 x 2 9
11 Graphing Linear Equations in Two Variables Graph the solution to each equation on the (x, y) coordinate axis, also known as a Cartesian Graph: 60. 3x 2y = x = y = y = 2x
12 Systems of Equations Solve the following systems of equations x 3y = 12 x 2y = x 3y = 4 y = 2x + 4 Square Roots and Radicals What are the square roots of the following numbers (answers will be whole numbers): Simplify the following radical expressions using the rules of radicals: 68. ( 8 )( 10 ) * ( ) ( ) 11
13 ANSWERS Order of Operations = (5) 7 = = = = 9 = 9 (4 5) 2 (1) (2x + 2) x = 6x x = 6x x = 5x x x = 4x x = 6x (x 2) 5 (3x 4) = 2x 4 15x + 20 = 13x + 16 Scientific Notation All numbers in scientific notation have the following form: power equaling number of places decimal moved Firstnonzerodigit.restofnumber X = 5.23 X X = 602,000,000,000,000,000,000, (3 x 10 3 ) (5 x 10 6 ) = 15 x 10 9 = 1.5 x x 10 9 = 2 x x 10 4 Substitution Find each value if x = 3, y =  4, and z = xyz 4z = (3)(4)(2) 4 (2) = = x z = 5(3) 2 = 15 2 = 13 xy (3)(4)
14 Operations with Negative Numbers Evaluate: (20) = = ( 32) = = (3) (6) = (6) = (2) (15) = (2) (1) (2) (1) (2) (2) (1) = (81) 9 = = /3 14 5/6 = 3 2/6 14 5/6 = 11 3/6 = 11 ½ 24. (3 1/3) (2 2/5) = (10/3) (12/5) = (2/1) (4/1) = (3.2) (50.7) = Exponents Evaluate: = 7 x 7 = = = = 2x2x2x2x2 = 32 Simplify: 30. x 2 x 3 x x 4 = x x y 3 x 3 y x 6 y 5 = x 10 y 9 13
15 Formulas Use the Rules of Equality 32. Solve PV = nrt for T. PV = nrt T = PV nr nr nr 33. Solve y = hx + 4x for x. y = x (h + 4) y = x (h + 4) (h + 4) (h + 4) y h + 4 = x Word Problems 34. One number is 5 more than twice another number. The sum of the numbers is 35. Find the numbers. Let x = another number, which forces One number to be 2x + 5. Since the sum of both numbers must be 35, then [2x + 5] + [x] = 35 Solve the equation (combine like terms and use Rules of Equality): [2x + 5] + [x] = 35 Combine like terms 3x + 5 = 35 3x = 35 5 Rule of Equality 3x = 30 3x = 30 Rule of Equality 3 3 x = 10 So, another number x = 10 and One number 2x + 5 = 25 14
16 35. John was twice Bill s age in the year Their combined age in 2010 is 71. How old were John and Bill in 2000? Let s say Bill s age in 2000 is x. Therefore John s age in 2000 is 2x. By 2010, their combined ages are 71. Also, by 2010, their ages each increase by 10 years. So Bill s age in 2010 is (x + 10), and John s age is (2x + 10). Therefore, in 2010, the following formula is true: (x+10)+(2x+10)=71 Combine like terms 3x + 20 = 71 3x = Rule of Equality 3x = 51 3x = 51 Rule of Equality 3 3 x = 17 Therefore, in 2000, Bill was 17, and John was 34. Inequalities Solve and graph on the number line x 7 3 2x x 10 2x x (x 4) (x + 1) < 12 3x 12 x 1 < 12 2x 13 < 12 2x < x < 1 2x < x < ½ ½ 15
17 Linear Equations in One Variable Solve the following for x: (again, combine like terms, use Rules of Equality) 38. 6x 48 = 6 6x = x 6 = 54 6 x = x (3x + 2) = 0 combine like terms 4x + 48 = 04x = 0 48 rules of equality 4x = 484x = rules of equality x = 12 Combining like terms only applies to addition and subtraction of algebraic terms of the same degree (same variable with same exponent coefficient doesn t matter) or to constants. Only LIKE terms may be added or subtracted. UNLIKE terms cannot be added or subtracted, but may be multiplied or divided. Ex: 2x 2 + x 2 = 3x 2 like terms can add 2x 2 + x +3 unlike terms cannot unlike terms CANNOT be added together, however: 2x 2 x 3 = 6x 3 they CAN be multiplied! (3x + 4) 2 (6x 2) = 22 multiply following order of operations 9x x + 4 = 22 combine like terms 3x + 16 = 223x = rules of equality 3x = 63x = rules of equality x = x 2 = 4 x 2 = 4 x = 2 or x = 2 Two solutions work as an answer! 42. x 2 =  4 x 2 = 4 No solution is possible! Neither the square of a positive nor a negative number can ever equal a negative number! 16
18 Multiplying Simple 1st degree Binomials Simplify the following (the FOIL method of multiplying binomials works here): 43. (x + 5) (x + 7) = x 2 + 5x + 7x + 35 = x x (2x 3) (4x + 2) = 8x x + 4x 6 = 8x x (6x + 6) (4x 7) = 24x x 42x 42 = 24x 2 18x (3x 8) (2x + 9) = 6x x 27x 72 = 6x 2 11x 72 FOIL method: (First, Outer, Inner, Last) Example: Multiply First terms first (a + b) (c + d) = ac then Outer terms (a + b) (c + d) = ac + ad then Inner terms (a + b) (c + d) = ac + ad + bc Last terms last (a + b) (c + d) = ac + ad + bc + bd Then combine like terms where possible. Factoring Steps to factoring: Always factor out the Greatest Common Factor if possible Factor the first and third term Figure out the middle term Factor out the following polynomials: 47. x 2 + 5x 6 = (x + 6) (x 1) x 4 4y 4 Factor out GCF (4) first = 4 (16x 4 y 4 ) Then factor 16x 4 y 4 = 4 (4x 2 y 2 ) (4x 2 + y 2 ) Then factor 4x 2 y 2 = 4 (2x y) (2x + y)( 4x 2 + y 2 ) Note: Cannot factor out (4x 2 + y 2 ) 49. 4x 2 36 = 4 (x 2 9) = 4 (x + 3) (x 3) y y + 36 = (7y + 6) (7y + 6) = (7y + 6) 2 17
19 Exponents and Polynomials Add and subtract like terms where possible. Remember x 1 = 1/x, x 2 = 1/x 2, and so on. Also x a x b = x a+b Simplify and write answers with only POSITIVE exponents: 51. (3x 2 5x 6) + (5x 2 + 4x + 4) = 8x 2 x x 4 32x x 2 8x 2 = 3x 2 4x (5a + 6) 2 = (5a + 6) (5a + 6) = 25a a + 30a +36 = 25a a x 3 3x 2 x 5 2x 5 3x 3 = 12x 6 6x 2 = 2x x 2 5x 5 = 3 x 7 Quadratic Equations Steps: Get zero alone on one side of the equal sign Factor out the resulting equation Set each factor to equal zero Solve each resulting factor equation the variable may have more than one solution Solve for the variable, which will have two solutions: 56. 4a 2 + 9a +2 = 0 (4a + 1) (a + 2) = 0 factor out the equation (already set to zero) 4a + 1 = 0 a = 1/4 a + 2 = 0 a = 2 Set each factor to equal zero, then solve each a equals 1/4 or 2 18
20 If the quadratic equation is in the form of ax 2 + bx + c = 0, and the equation is difficult or impossible to factor, then use the QUADRATIC FORMULA. It always works. + means + or X = b + b 2 4ac 2a 57. (3x + 2) 2 = 16 (3x + 2) (3x + 2) = 16 9x x +4 = 16 9x x = x x 12 = 0 Factor (3) (3x 2) (x + 2) = 0 Solve factors for zero 3x 2 = 0 x = 2/3 x + 2 = 0 x = 2 x = 2/3 or x = 2 OR USE Quadratic Formula method (See above) 9x x 12 = 0 a= 9 b= 12 c= 12 x = = 2/3 OR 2 19
21 Rational Expressions Perform the following operations and simplify where possible. If given an equation, solve for the variable a = 5 This is an equation that can be solved for a. 2a 2 a 2  a Like adding fractions, you need to find a common denominator. Factor the denominators to see what you need: 4 + 3a = 5 Both denominators share (a 1). Multiply the first 2 (a 1) a (a 1) expression by a/a and the second by 2/2. 4 a + 3a 2 = 5 2 (a 1) a a (a 1) 2 4a + 6a = 5 Both denominators are the same now. Just add the 2a (a 1) 2a (a 1) numerators. 10a = 5 Reduce by dividing expression by 2a/2a 2a (a 1) 5 = 5 Solve for a a 1 5 (a 1) = 5 (a 1) Use Rules of Equality a 1 Multiply both sides by a 1 5 = 5 (a 1) Divide both sides by 5 5 = 5 (a 1) = a 1 Add 1 to both sides = a = a An equation can be solved for the variable because there is an equal sign (=) with at least one algebraic term on both sides. Ex: 2x = 4 An algebraic term may merely be a number, and it is then called a constant. An expression can only be simplified, NOT solved for the variable, because there is no equal sign with algebraic terms on both sides. Ex: 7x + 5x 2 20
22 x 2 x2 2x 8 This is NOT an equation that can be solved for x x 2 + 2x 8 4 x 2 it can only be simplified. Division of rational expressions like with fractions is the same process as multiplication with one extra step invert the divisor (on the right) then multiply. ` Remember: (x + 1) = (1 + x) commutative property of addition Important factoring hint to remember: (1 x) = 1 (x 1) 16 x 2 x 4 x2 Now factor out all polynomials x 2 + 2x 8 x 2 2x 8 (4 x) (4 + x) x (2 x) (2 + x) (x 2) (x + 4) (x 4) (x + 2) Use factoring with 1 hint from above 1 (x  4) (4 + x) x 1 (x  2) (2 + x) (x 2) (x + 4) (x 4) (x + 2) 1 (x  4) (4 + x) x 1 (x  2) (2 + x) Then cancel (x 2) (x + 4) (x 4) (x + 2) Remember Commutative property 1 (x  4) x 1 (x  2) Then cancel more (x 2) (x 4) (1) (1) = 1 Simplified answer is ONE 21
23 Graphing Linear Equations in Two Variables Graph the solution to each equation on the (x, y) coordinate axis, also known as a Cartesian Graph. For every different value of x, there will a different value of y, and vice versa. Therefore, there are an infinite number of solutions, consisting of pairs of values for x and y, called ordered pairs (x,y). Try to select values that will stay within your graph. The yintercept is wherever the graph intersects the y axis. The xintercept is wherever the graph intersects the x axis, Create a table of values (at least three ordered pairs), and plot each point (x,y) on the graph. You plot a point by finding where the x and y values intersect based on their location on the x axis (horizontal) and y axis (vertical). Draw a straight line through the points. Every point on the line is a solution to the equation x 2y = 6 point x y A 4 3 B 2 0 C 03 D x 2y = 6 A B C C D 22
24 61. x = 3 This type of linear equation means that x must always equal 3, no matter what the value of y. It creates a solution line parallel to the y axis at x = 3. point x y A 3 3 B 3 0 C A B C 62. y = 0 This type of linear equation means that y must always equal 0, no matter what the value of x. It creates a solution parallel and equal to the x axis. point x y A 3 0 B 0 0 C 3 0 C B A 23
25 63. y = 2x Point x y A 6 1 B 3 3 C 0 5 D 3 7 E 6 9 E A 24
26 Systems of Equations The following are 2 dimensional linear equations, and each represents a line that can be graphed on the coordinate plane. The solution to a system of equations is where the lines representing each linear equation will intersect. This can actually be accomplished without graphing in the following manner x 3y = 12 x 2y = 9 multiply by 2, you get 2x + 4y = 18 First, try to figure out what to multiply each term in one equation by in order to identically match a like term in the other equation, but with an opposite sign. If we multiply the second equation by 2, then the x term will become 2x, the opposite of 2x in the first equation. Then combine the like terms between each equation. The 2x and the 2x will cancel out, allowing you to solve for y. 2x 3y = 122x + 4y = 18 y = 6 Now plug the discovered value y = 6 into either of the original formulas and solve to determine the value of x. Both formulas should give the same value for x. 2x 3(6) = 12 x 2 (6) = 9 2x 18 = 12 x 12 = 9 2x = 6 x = 3 x = 3 The answer is x = 3 and y = 6. If you had graphed each equation carefully, they would intersect at point (3, 6) x 3y = 4 y = 2x + 4 First rearrange the second equation to line up like terms y + 2x = 2x +2x + 4 2x + y = 4 Now multiply the second equation by 1, so the 2x terms in each equation will have opposite signs. 2x + y = 4 multiply by 1, you get 2x y = 4 Combine the like terms of each equation. The 2x and 2x will cancel out. 2x 3y = 42x y = 44y = 8 y = 2 Plug the value of y = 2 into each original formula and solve for x. 2x 3 (2) = 4 2 = 2x + 4 x = 1 x = 1 The answer is x =1 and y = 2. 25
27 Square Roots and Radicals What are the square roots of the following numbers (answers will be whole numbers): = = 11 Simplify the following radical expressions using the rules of radicals: 68. ( 8 )( 10 )=( )= = = Knowledge of multiplication table, prime numbers and prime factoring can be helpful here = = = 1/ ( ) ( ) Use the FOIL method =
28 Arithmetic Overview The Arithmetic section of ACCUPLACER contains 17 multiple choice questions that measure your ability to complete basic arithmetic operations and to solve problems that test fundamental arithmetic concepts. Expect to see the following concepts covered on this portion of the test: Operations with whole numbers and fractions such as addition, subtraction, multiplication, division, recognizing equivalent fractions and mixed numbers, and estimating. Operations with decimals and percents, including addition, subtraction, multiplication, and division with decimals. Percent problems, recognition of decimals, fraction and percent equivalencies, and problems involving estimation are also given. Problems that involve applications and problem solving are also covered, including rate, percent, and measurement problems, simple geometry problems, and distribution of a quantity into its fractional parts. Testing Tips Start the solving process by utilizing basic Arithmetic skills and formulas. Then if advanced mathematical skills are required such as Algebra, use those skills next. Use resources provided such as scratch paper or the calculator to solve the problem. DO NOT attempt to only solve problems in your head. Try putting your answer back into the original problem to confirm that your answer is correct. Make an educated guess if you are unsure of the answer. 27
29 Arithmetic Tips Test takers should be familiar with the following detailed list of concepts. For additional practice exercises using these concepts, please utilize the resources listed at the end of this guide. Whole Numbers and Money Rounding whole numbers and dollars and cents Adding (larger numbers, by regrouping, dollars and cents) Subtracting (larger numbers, by regrouping, dollars and cents) Regrouping / borrowing Multiplying (larger numbers, by regrouping. By zeros) Dividing (using long division, remainders, zero as a placeholder, larger numbers) Fractions Prime and composite numbers, prime factoring Like fractions and unlike fractions Reducing and raising fractions Converting between mixed numbers and improper fractions Adding and subtracting like fractions with mixed and whole numbers Lowest Common Denominator (LCD) Adding and subtracting unlike fractions with mixed and whole numbers Comparing / ordering decimal fractions Reading and writing mixed decimals Estimating with mixed decimals Adding and subtracting decimals Rounding to a chosen place value Using zeros as placeholders Multiplying decimals by whole numbers Changing a fraction to a percent Changing a decimal to a percent Changing a percent to a fraction Changing a percent to a decimal Finding the part, percent, and whole Borrowing with subtraction of fractions with mixed and whole numbers Multiplying and dividing with fractions, mixed numbers, and whole numbers Canceling to simplify multiplication Solving proportions Creating and solving proportions in word problems Decimals Multiplying decimals by decimals Multiplying by 10, 100, or 1000 Dividing decimals by whole numbers Dividing decimals by decimals Dividing by 10, 100, or 1000 Converting decimals to fractions Converting fractions to decimals Percents Finding percent increase or decrease Finding the original price Understanding simple interest Computing interest for part of a year 28
30 PRACTICE QUESTIONS Whole Numbers Place Value 184, 276, 091 Which digit in the number above holds the following place values? Addition 1. ten thousands 2. hundreds 3. hundred millions 4. tens 5. millions 6. hundred thousands ,029 = 8. 72,928 27, ,902 Subtraction 9. 79,58253, , ,
31 Multiplication x 235 = x , x , x Division = = ANSWERS , , , , , , ,170, ,219, Remainder 6 30
32 Prime vs. Composite Numbers and Prime Factoring Prime Number  an integer that can only be divided by one and itself without a remainder Composite Number  an integer that is not prime, and can be divided into prime factors Prime factors  the multiplication factors of a composite number that are prime themselves 17. Write down the first six prime numbers in order below,,,,, For the following questions, indicate whether the number is prime or composite. If it is a composite number, then break it down into its prime factors. If it is a prime number, just write the word prime: Fractions ANSWERS 17. 2,3,5,7,11, x2x2x3 19. prime 20. 5x x x3x5 23. prime Numerator: tells how many parts you have (the number on top) 3 Denominator: tells how many parts in the whole (the number on the bottom) 4 Proper fraction: top number is less than the bottom number: Improper fraction: top number is equal to or larger than the bottom number 4 9 Mixed Number: a whole number is written next to a proper fraction: 5 ½ ¾ Common Denominator: is a number that can be divided evenly by all of the denominators in the problem. For 2 3 some common denominators are 12, 24, 36, 48. The lowest common 3 4 denominator (LCD) would be
33 Reducing Fractions Any time both the numerator and denominator of a fraction can be divided by the same number, then the fraction can BE REDUCED (even when part of a mixed number just leave the whole number alone)! A fraction in lowest terms is a fraction that cannot be reduced any further. EX: 56 = 56 2 = 28 = 28 7 = 4 Reduced to lowest terms ALT Prime Factoring EX: 56 = 2x2x2x7 = 2x2x2x7 = x5x7 2x5x7 5 The alternate prime factoring method involves breaking both the numerator and the denominator into prime factors, then canceling any factors they both share one to one. Whatever remains is the reduced fraction. This method is valuable with larger and trickier fractions. Reduce the following fractions: ANSWERS 24. 3/ / / /5 Raising Fractions Raising a fraction to higher terms to create an equivalent fraction is the same thing in reverse (AGAIN even when part of a mixed number)! You have to multiply the numerator and denominator by the same number, and then you will have an equivalent raised fraction. raised EX: 4 = 4x7 = 28 = 28x2 = 56 higher equivalent 5 5x x2 70 fractions Simple as that! Of course, YOU have to see what you can divide by to reduce, or choose what to multiply by to raise! Better know your prime numbers and multiplication table perfectly! SO, when you have to raise a fraction to a higher equivalent fraction with a given denominator (such as an LCD), do this: EX: 3 =?
34 Figure out how many times the old denominator (7) goes into the new denominator (56) 3? 7 x 8 = 56 Then take that factor (8 in this case), and multiply it times the old numerator to get the new numerator!! 3 x 8 = 24 so 3/7 = 24/56!! 7 x 8 56 Easy as that! Raise the following fractions by finding new numerator: =? =? 8 56 ANSWERS =? 5 45 Converting Mixed Numbers and Improper Fractions An improper fraction is any fraction that is equal to 1 or higher: EX: 2/2, 9/8, 5/3 A proper fraction is always less than 1! EX: ½, 7/8, 11/12 A mixed number is any combination of a whole number and a fraction: EX: 3 ½, 4 ¾, 2 5/4, 3 ¼ p.s: Remember, a mixed number really means the whole number PLUS the fraction! 3 ½ = 3 + ½!!! Mixed numbers can have equivalent improper fractions, and vice versa. You must be able to convert back and forth! To convert a mixed number to an equivalent improper fraction: EX: 8 ¾ Keep the denominator? 4 Multiply the whole number (8) times the denominator (4) This tells you how many fourths are in 8 alone! 4x8=32 Next, add that 32 to the old remaining numerator (3) This tells you how many fourths are in 8 ¾! 32+3=35 33
35 Place the 35 above 4 as the new numerator, and you have your equivalent improper fraction! ¾ = 35 4 Convert the following mixed numbers into improper fractions: ¼ ½ /3 ANSWERS / / / / /7 To convert an improper fraction back to an equivalent mixed number (or whole number): EX: This is what REALLY happens to remainders in division!!! 35 numerator 4 denominator You must divide the numerator by the denominator using long division, and any remainder becomes the new numerator over the old denominator/divisor! 8 ¾ 35 4 = 8 R3 = 8 ¾ Convert the following improper fractions back into mixed numbers. If the resulting mixed number has a fraction that can be reduced, then reduce it: / / / / 3 ANSWERS / / /3 34
36 Equivalent Mixed Numbers Intro to Borrowing Seemingly different mixed numbers can be equivalent (equal), and you can determine this as long as you remember that a mixed number is actually a form of addition (2 2/5 = 2 + 2/5) Borrowing Example (needed later for subtraction of mixed fractions): 2 2/5 = /5 = 1 + 7/5 = 1 7/ /5 = 5/5 +7/5 = 12/5 1) Borrow 1 from the whole number 2 in the mixed number 1) Now separate the remaining whole number 1 in the mixed number 2) Take that 1, add it to the 2/5 that was already there originally, and then convert the 1 2/5 to 7/5 ( 1 = 5/5) 1 2/5 = 5/5 + 2/5 = 7/5 2) Again, Take that 1, and convert it to 5/5, and add it to the 7/5 that was there originally 5/5 + 7/5 = 12/5 SO, you can see that 2 2/5 = 1 7/5 = 12/5 They are equivalent, or EQUAL! Same value! Convert the following mixed numbers into equivalent mixed numbers as indicated: = 4? = 11? = 64? ANSWERS / / /11 35
37 Adding and Subtracting Like Fractions Like fractions merely refer to fractions that have the same denominator. It includes mixed numbers whose fractions have the same denominator. Fractions which have the same denominator are the easiest to add and subtract, because all that is necessary is to add (or subtract) their respective numerators. The denominator remains the same. EX: 3/7 + 1/7 = 4/7 5/11 + 3/11 = 8/11 4/5 1/5 = 3/5 11/15 7/15 = 4/15 When adding or subtracting mixed numbers and fractions with like denominators, you can just add (or subtract) the whole numbers and fractions separately, and combine them at the end. EX: 7 3/ /7 = 15 4/7 11 5/ /11 = 24 8/ /9 + 1/9 = 25 5/9 15 2/17 + 3/ /17 = 35 10/ /5 9 1/5 = 13 3/ / /15 = 21 4/ /11 4/11 = 35 3/11 Occasionally, when you add (or subtract) fractions, your answer results in an improper fraction and/or an unreduced fraction. Generally, when this happens, you MUST clean up your answer. If possible, you MUST convert the improper fraction back to a mixed or whole number. If the resulting mixed number s fraction can be reduced, you MUST reduce it. EX: 3/7 + 4/7 = 7/7 = 1 5/8 + 4/8 = 9/8 = 1 1/8 5/8 + 5/8 = 10/8 = 1 2/8 = 1 1/4 (needed to reduce 2/8 to 1/4) 9/10 3/10 = 6/10 = 3/5 (needed to reduce 6/10 to 3/5) If the answer results in a mixed number containing an improper fraction, that MUST be corrected also. EX: 10 3/ / /5 = 19 9/5 = 20 4/5 (9/5 = 1 4/5) 22 7/9 + 4/ /9 = 30 18/9 = 32 (18/9 = 2) 36
38 Add or subtract the following like fractions as indicated. If your answer results in an unreduced fraction or improper fraction, correct it: 42. 3/5 + 4/5 + 2/5 = 43. 7/ /15 + 4/15 = 44. 7/8 3/8 = /9 5 5/9 = / / /6 = ANSWERS / / / / / / / /14 = /18 4/18 = Subtracting Fractions from Whole and Mixed Numbers Borrowing Sometimes when you subtract, you run into some new problems. The first problem arises when you subtract a fraction from a whole number. 15 7/8 = what do you subtract the 7/8 from? There is no like fraction. If you need a like fraction, you MAKE one by borrowing one from the whole number. You never need to borrow more than 1. Once you borrow that 1, you make it into a like fraction with the denominator you need! The number 1 can be made into any fraction you want, as long as the numerator and denominator stay the same. EX: 1 = 1/1 = 2/2 = 3/3 = 4/4 = 5/5 = 6/6 = 7/7 and so on. Get the idea? So let s look at our problem again. What if we borrow 1 from the 15, and make it into 8/8? Watch! 15 = 14 8/8 by borrowing, we can now solve the problem above. 15 7/8 = 14 8/8 7/8 = 14 1/8 Same thing for subtracting mixed numbers from whole numbers. EX: /7 = 74 7/7 22 4/7 = 52 3/7 The second problem can sometimes arise when subtracting mixed numbers. 25 2/7 18 5/7 = You can t subtract 2/7 5/7!! But you can BORROW! 37
39 Borrow 1 from the 25, make it 7/7, and then add it to the 2/7 that is already there. 25 2/7 = 24 9/7!! Remember you did this earlier in the study guide? This is where you really need it! Borrowing is your best friend when subtracting with fractions! Now let s complete the problem. 25 2/7 18 5/7 = 24 9/7 18 5/7 = 6 4/7 There is another alternative to borrowing, but it doesn t always work easily Make mixed numbers (or whole number and mixed number) into improper fractions first, then subtract, then clean up your answer. EX: 25 2/7 18 5/7 = 177/ 7 131/ 7 = 46/ 7 = 6 4/7 EX: /9 = 135/ 9 40/9 = 95/ 9 = 10 5/9 This method becomes more difficult as the whole numbers involved get larger, whereas borrowing will NEVER let you down! Which method would YOU use to solve 789 3/ /14? Do I really have to ask? I think you get the idea. BORROWING is the way to go!!! 789 3/ /14 = / /14 = 213 6/14 = 213 3/7 (reduce!) Now you try it. Subtract the following like fractions as indicated. If your answer results in an unreduced fraction or improper fraction, correct it: /18 = /20 = / /13 = ANSWERS / / / / /14 = REMEMBER BORROWING IS ONLY NEEDED FOR SUBTRACTION!! AND ONLY SOME OF THE TIME! LEARN TO RECOGNIZE WHEN YOU NEED IT! 38
40 Adding and Subtracting Unlike Fractions With Different Denominators You CANNOT add or subtract unlike fractions or mixed numbers which have different denominators!! You must FIND a common denominator (hopefully the LOWEST common denominator), and convert the fractions into that common denominator FIRST! If the denominators are different, you MUST find the least common denominator (LCD), and convert all fractions (even in mixed numbers) to that LCD before adding or subtracting! Remember a common denominator is a number that all the denominators of the fractions being added or subtracted together can be divided into evenly with no remainder. The method of converting the fractions to the new common denominator was already shown to you in RAISING FRACTIONS. You had better review that right now if you have forgotten. But what we haven t done is discuss how to FIND the lowest common denominator first. There are many methods. The easiest method is to just multiply all the denominators together. That will always give you a common denominator, but rarely the lowest. Another method is to keep creating multiples of each denominator until a common multiple is found. EX: 1/6, 1/10 the LCD is 30 6 > 6, 12, 18, 24, > 10, 20, 30 The best method involves prime factoring. Remember that? You can use it. Finding LCD (Lowest or Least Common Denominator): Place each denominator in a column, one below the next, with an empty row next to each denominator. Factor out each denominator into its PRIME factors from lowest to highest, and place them in order in the empty row next to the denominator. Identical factors must be stacked in the same column once per row whenever possible. Arrange carefully! Do NOT place different factors in the same column. Do NOT allow nonprime composite factors to be placed in the grid. 1/2 + 1/8 + 1/10 + 1/15 2 = 2 8 = 2 X 4 2 X 2 10 = 2 X 5 15= 3 X 3 X 5 LCD= 2 X 2 X 2 X 3 X 5 = 120 Finally, in the bottom row multiply the common factor of each column together to get LCD 39
41 EXAMPLES (LOOK CAREFULLY!!!!!!): 1/3 + 1/6 + 1/14 3 = 3 6 = 2 X 3 14 = 2 X 7 LCD = 2 X 3 X 7 = 42 1/4 + 1/6 + 1/9 + 1/10 4 = 2 X 2 6 = 2 X 3 9 = 3 X 3 10 = 2 X 5 LCD = 2 X 2 X 3 X 3 X 5 = 180 1/2 + 1/4 + 1/8 2 = 2 4 = 2 X 2 8 = 2 X 2 X 2 LCD = 2 X 2 X 2 X = 8 Now you try it. Find the lowest common denominator for the following sets of fractions: 53. 1/6, 3/8, 7/ /3, 5/6, 4/ /3, 3/4, 2/7, 11/14 ANSWERS /4, 1/5, 1/6, 3/10, 4/15 40
42 REMINDER  RAISING FRACTIONS: Next, you have to raise fractions to a higher equivalent fraction with a given denominator (LCD) in order to ADD OR SUBTRACT, for example: 2 3/7 + 11/56 (LCD=56) EX: 3 =? 7 56 (LCD) Figure out how many times the old denominator (7) goes into the new denominator (56) 3? 7 x 8 = 56 Then take that factor (8 in this case), and multiply it times the old numerator to get the new numerator!! 3 x 8 = 24 so 3/7 = 24/56!! then 2 24/ /56 = 2 35/56 = 2 5/8 7 x 8 56 Easy as that! NOW YOU ARE READY! When adding (or subtracting) fractions or mixed numbers with different denominators, they must be changed so that they have the SAME denominators! This is why LCD is so important it is the LOWEST or LEAST common denominator necessary to convert them to! IT SAVES HEADACHES! EX: 3/8 + 5/6 First, determine the LCD (method shown in previous pages), which is 24 Second, convert the fractions into equivalent fractions with the same LCD 9/ /24 Third, now that they have the same denominator, just add the numerators, leave the denominator alone! 9/ /24 = 29/24 Fourth, if your answer is an improper fraction, it should be changed into its equivalent mixed number, and reduced if necessary 29/24 = 1 5/24 the fraction 5/24 cannot be reduced ***NOTE: When adding (or subtracting) with mixed numbers, you DON T need to convert to improper fractions at all, just add (or subtract) the whole numbers and fractions separately! First just convert the fractions within the mixed numbers to the LCD! 41
43 EX: / /6 First, determine the LCD, which is 42 Second, convert the fractions only into equivalent fractions with the same LCD / /42 Third, now that the fractions have the same denominator, just add the whole numbers and the fractions separately / /42 = /42 Fourth, if your answer is a mixed number with an improper fraction in it, you must convert the improper fraction into a mixed number, and add this to the whole number! Then reduce if necessary /42 = /42 = /42 = /42 now reduce! /42 = /21 correct answer! AND DON T FORGET BORROWING! For example, when you are subtracting 251 1/ /8 First, you convert only the fractional part of each mixed number to fractions with the same LCD (lowest common denominator): 251 1/ /8 = 251 4/ /24 Afterward, however, you discover that you can t subtract 4/24 21/24! BUT you can borrow 1 from the 251 and add it to the fraction 4/24 to make it bigger!!! This makes it an equivalent improper mixed number! Take 1 from the 251, leaving 250 That 1 is actually equal to 24/24, right? Change it to 24ths!! Then add it to the 4/24 that is already there!! = = 24/24!!! 1 + 4/24 = 24/24 + 4/24 = 28/24!!! Then attach the new raised fraction to the 250!!! 251 4/24 = /24 42
44 Then you can subtract the whole numbers and the fractions separately with your new improved improper mixed number! / /24 = 120 7/24 You NEVER really need to convert mixed or whole numbers entirely to improper fractions when you are adding/subtracting! Only when you are multiplying/dividing! Now you try it. Add and subtract the following fractions. Make sure your answers are not improper fractions and are reduced: 57. 5/6 + 7/9 = 58. 1/2 + 3/4 + 3/8 = /3 + 7/ /6 = /21 4/15 = /8 25 3/10 = /9 91 5/6 = ANSWERS / / / / / / / /10 28 ¾ = Multiplication and Division of Fractions Multiplication and division of fractions is ENTIRELY different than adding and subtracting, mainly because [1] you do NOT need to convert the fractions to a lowest common denominator and [2] you DO need to convert any mixed numbers to improper fractions first (in fact, right away!). When you have a multiplication problem, such as 3 ¾ X 8 : Step 1: Convert any mixed numbers to improper fractions, and even whole numbers should be converted to improper fractions: 15 X 8 3 ¾ = 15 8 = Step 2: Canceling! Any numerator on top and denominator on the bottom that can be evenly divided by the same number, should be divided: 15 X =2 15 x =1 1 1 You should continue canceling until it cannot be done any more! 43
45 EX: 7 X 5 X X 5 X X 5 1 X X 1 X 3 1 = 1 x 1 x Step 3: Just multiply the remaining numerators together, and then multiply the remaining denominators together. 1 x 1 x 1 = 1 4 x 2 x 1 8 from previous example> 15 x 2 = 30 = 30 1 x 1 1 If you have cancelled completely, you will not need to reduce your answer to lowest terms. But you should check anyway! Division Division is the same as multiplication, except you must invert (turn upside down) the divisor on the right after Step 1 and before Step 2. Then just continue on as if you were multiplying. Turning a fraction upside down is creating its reciprocal. EX: 3 ¾ 2 ¼ Step 1: 15 9 convert mixed numbers to improper fractions
46 STEP 1A: 15 X 4 invert divisor, change to multiplication 4 9 Step 2: 15 5 X 4 1 thorough canceling Step 3: 5 X 1 = 5 multiply remaining numerators 1 X 3 3 and denominators = 1 2/3 don t leave answer as improper fraction Now you try it. Multiply and divide the following fractions and/or mixed numbers /8 X 10/21 = X 5 X 8 X 11 = /4 X 3 3/5 = /10 X 100 = /8 X 4 4/9 = 69. 3/4 9/16 = /3 2 1/6 = /6 1 17/18 = ANSWERS 64. 5/ / ½ / / /7 100 = 45
47 Ratios and Proportions Solving a doubleratio or proportion problem with one unknown involves crossmultiplication, and then solving the resulting equation (as in basic algebra). EX: N = 15 N =? N = 15 75N = (10) (15) N = 150 crossmultiply 75N = N = 2 REMEMBER! You can t CANCEL like you do in multiplying/dividing fractions! These are proportions, with an = sign in between! JUST CROSS MULTIPLY AND SOLVE! The variable may be anywhere in the ratio/proportion, just use the same procedure: EX: 3 = 18 18X = (3) (90) X 90 18X = X = X = 15 ***If the answer does not come out evenly as a whole number, use the remainder in the division to create a mixed number as the answer: 23 1/7 EX: 7 = 18 7P = (9) (18) P 7P = P = P = 23 1/7 1 Not as hard as you think! 46
48 Some proportion problems: = N = 45 N N = ANSWERS 73. N = N = N = N = 38 4/ /20 = N/2600 N = /200 = N/4500 N = /11 = N/484 N = = 30 9 N Proportion word problems: 77. If 3 in 20 people are lefthanded, how many lefthanded people would there be in a group of 2600 people? 78. In the Amazon River, 6 of every 200 fish species will become extinct this year. If there are 4500 species of fish in the Amazon now, how many will become extinct this year? 79. Nine out of eleven students who enter high school successfully graduate at the end of four years. In a high school with 484 entering students, how many may be expected to graduate successfully? 47
49 DECIMALS Adding and Subtracting Decimals To add or subtract decimals: 1) Line up the decimal points 2) Add or subtract normally 3) Remember, whole numbers line up on the left of the decimal point EX: = EX: = NOTE: When subtracting, if one decimal is longer than the other, add zeros to the right and make them the same length before subtracting. EX: =
50 Rounding Numbers Rounding is not that tough. The FIRST THING you have to know is place value, because you will be asked to round to a particular place in the number: Whole Number Places ones or units tens hundreds thousands ten thousands hundred thousands millions ten millions hundred millions Decimal Places (end in th) tenths hundredths thousandths ten thousandths hundred thousandths millionths 345, 976, ROUNDING TO THE WHOLE NUMBER PLACES 1. Round the above number to the thousands: The 6 is in the thousands place, so we must look at the number AFTER it: the 0. If the number after the 6 is 5 to 9, you raise the 6 to 7 (round up) If the number after the 6 is 0 to 4, you leave the 6 alone! (round down) Since the number after the 6 is a 0, we leave the 6 alone! (round down) Next, we replace all the numbers after the 6 with zeros up to the decimal point! Answer: 345, 976, Round the above number to the hundred thousands: The 9 is in the hundred thousands place, so we look at the number AFTER it: the 7. Since the 7 is between 5 to 9, we raise the 9 before it to a 10! When we do that, the 9 becomes a 0, and the 5 in front of the 9 gets 1 added to it, to become a 6! Replace all numbers after the rounded place with zeros up to the decimal point. Answer: 346,000,000 So, watch out for those 9 s, they might become 10 s! ROUNDING TO THE DECIMAL PLACES 3. Round the above number to the tenths: The 9 is in the tenths place, so we look at the number AFTER it: the 8. Since the 8 is between 5 to 9, we raise the 9 before it to a 10! When we do that, the 9 becomes a 0, and the 1 in front of the 9 gets 1 added to it, to become a 2! We leave a zero in the tenths place. Answer: 345, 976,
51 345, 976, ROUNDING TO THE DECIMAL PLACES 4. Round the above number to the thousandths: The 2 is in the thousandths place, so we look at the number AFTER it: the 5. Since the 5 is between 5 to 9, we raise the 2 before it to a 3! We do not need to attach any zeros after the 3, because we were rounding to the thousandths place, and additional zeros are not needed after the rounded place in decimal places (to the right of the decimal point). Answer: 345, 976, ***GENERAL RULE FOR ROUNDING Always look at the digit AFTER the place to be rounded: If it is between 5 to 9, ROUND UP (add 1) the place to be rounded! If it is between 0 to 4, ROUND DOWN (leave it alone) the place to be rounded! o If you are rounding to a whole number place, fill zeros in UP TO THE DECIMAL POINT as necessary o If you are rounding to a decimal place, there is no need to add zeros beyond the place being rounded o If a 9 digit rounds up to a 10, you MUST add one to the digit on the LEFT SIDE and leave a zero where the 9 was. This only happens with 9s!! Now you try it. 2 3, Round this number to the place value indicated: 80. thousandths 81. hundredths 82. tenths 83. ones (units) 84. tens 85. hundreds ANSWERS thousands 50
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