# SAT Mathematics. Numbers and Operations. John L. Lehet

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1 SAT Mathematics Review Numbers and Operations John L. Lehet

2 Properties of Integers Arithmetic Word Problems Number Lines Squares and Square Roots Fractions and Rational Numbers Factors, Multiples and Remainders Prime Numbers Ratios, Proportions and Percents Sequences Sets Counting Problems Logical Reasoning

3 Properties of Integers Integers: Even Numbers: Odd Numbers:, -4, -3, -2, -1, 0, 1, 2, 3, 4, negative positive, -4, -2, 0, 2, 4,, -5, -3, -1, 1, 3, 5, 0 is neither positive nor negative! 0 is an even number! Addition of Integers: Multiplication of Integers: even + even = even odd + odd = even odd + even = odd even x even = even odd x odd = odd odd x even = even = = = 7 4 x 8 = 32 5 x 3 = 15 3 x 4 = 12 Consecutive Integers: 5, 6, 7, , 1004, 1005, 1006, , -11, -10 n, n+1, n+2, n+3, where n is any integer Problem 1: If three consecutive integers sum to 150, what is the smallest of the three? Problem 2: If four consecutive odd integers sum to 64 what is the largest of the four?

5 Number Lines As you move to the left Numbers DECREASE As you move to the right Numbers INCREASE A B C D E F G H I Problem 1: On the above number line, what is the value of G? Problem 2: On the above number line, the ratio of AC to AE is equal to the ratio of CD to what? R NOTE: The tick marks do not have to be integer distances! Problem 3: On the above number line, what is the value of R?

6 Squares and Square Roots Know your Perfect Squares! 1,4,9,16,25,36,49,64,81,100,121,144 if x = y, then y 2 = x 49 = 7, so 7 2 = = -9, so (-9) 2 = 81 Given a real number n if n > 1, then n 2 > n Example: Let n = 5, then 25 > 5 if 0 < n < 1, then n 2 < n Example: Let n = 0.5, then 0.25 < 0.5 ( n ) 2 = n2 d 4 d 2 9 ( ) 2 = 42 9 =

7 Addition: Numbers and Operations Fractions and Rational Numbers a d + b d = a+b d Subtraction: a d - b d = a-b d NOTE: to add or subtract fractions, you need a COMMON DEMOMINATOR! Multiplication: a c x b d = ab cd Division: a c b d = ad bc NOTE: to divide fractions, just Cross Multiply a c b d Fractions to n = n d NOTE: to convert a fraction to a decimal, just divide Decimals: d = n d the numerator by the denominator! Decimals to Fractions: NOTE: recognize.25,.33,.5,.66,.75! Reciprocals: d The reciprocal of Place Value: n d is n NOTE: A number times its reciprocal is 1! 2 3 x = (2)(3) 3 2 (3)(2) = 6 = is in the ones place 4 is in the tens place 3 is in the hundreds place 2 is in the thousands place 6 is in the tenths place 7 is in the hundredths place 8 is in the thousandths place 9 is in the ten-thousands place Scientific Notation: 431,000,000 = 4.31 x = 4.31 x 10-5

8 Factors, Multiples and Remainders Factors: Multiples: Positive integers that evenly divide into a number Example: the Factors of 36 are 1,2,3,4,6,12,18 and 36 Any number that can be divided by the original number evenly (with no remainder) Example: Multiples of 3 are 3,6,9,12,15,18,21, NOTE: if x is a factor of y and z is a multiple of y then x is a factor of z and z is a multiple of x Example: 4 is a factor of 12 and 36 is a multiple of 12, so 4 is a factor of 36 and 36 is a multiple of 4! Remainders: The result left over after a division Example: 7 3 = 2 with a remainder of 1 NOTE: a remainder is always smaller than the dividend Prime Numbers: A positive integer greater than 1 with exactly two factors, 1 and itself Example: 2,3,5,7,11,13,17,19,23, are the first nine primes NOTE: 1 is NOT a prime Problem 1: Which of the following can not be a reminder when dividing by 5? 0,1,3,4 or 5 Problem 2: What is the least common multiple of 2, 3 and 4? Problem 3: What is a prime number between 70 and 80?

9 Ratios: Numbers and Operations Ratios, Proportions and Percents The relationship between two quantities Example: My favorite book has 400 words per page, therefore, the ratio of words to pages is 400 to 1 NOTE: Ratios can be expressed as a fraction with a colon 400:1 or verbally 400 to 1 Proportions: An equation in which the two expressions are ratios Example: x 40 Percents: Percent is a ratio in which the second quantity is 100 = NOTE: Often proportions are given in which an unknown must be found (Cross multiply and solve) Example: 35% means the ratio of 35 to 100 or 35:100 or NOTE: Percent means Parts of 100 Problem 1: Solve the following for x x 40 = Problem 2: If a sale is buy two and get one free, what is the percent savings? Problem 3: The length of a rectangle is three times the width. If the perimeter is 30 ft, what is the width?

10 Sequences Sequences: A sequence is an ordered list of numbers following a pattern Example: 4,7,10,13,16, is a sequence in which each value is 3 more than the previous value. In this example, the n th term is equal to 4 + 3(n-1). Example: 4,16,64,256, is a sequence in which each value is 4 times the previous value. In this example, the n th term is equal to 4 n. This sequence is geometric sequence that has exponential growth. Problem 1: Given a sequence of numbers {1,4,7,10,13, }, what is the 10 th term? What is the sum of the 20 th and 21 st terms? Problem 2: Given a sequence of numbers {3,6,12,24,48, }, what is the 7 th term? What is the 10 th term? What is the average of the 8 th and 9 th terms?

11 Sets Set: Union: Intersection: A collection of elements Example: A = {2,4,6,8,10,12, } is the set of positive integers NOTE: A set is denoted using brackets { } Example: B = {n n is divisible by 3} is the set of all multiples of 3 The Union of two sets is the collection of elements in EITHER set Example: A = {2,3,5,7} and B = {2,4,6,8}, NOTE: Union is denoted U then the union of A and B is {2,3,4,5,6,7,8} and is denoted A U B The Intersection of two sets is the collection of elements in BOTH sets Example: A = {2,3,5,7} and B = {2,4,6,8}, NOTE: Intersection is denoted then the intersection of A and B is {2} and is denoted A B Problem 1: What is the intersection of all prime numbers and all even integers? Problem 2: Given A={1,2,4,8,16,32} and B={2,3,6,12,24,48}, what is A U B and A B?

12 Counting Problems A counting problem attempts to determine the number of possible ways elements of groups can be selected. For example, If there are two groups of children, the first group has 3 boys and the second group has 2 girls, how many different ways can one boy and one girl be selected? For each boy, there are two possible choices from the group of girls, so there are 6 possible combinations! Permutation: Combination: A selection of elements in which each element can be selected only once Example: using the numbers {1,2,3,4} how many 3 number codes can be made? There are four possible choices for the first number, three for the second number (because the first number can not be reused) and two for the third number (because the first two numbers can not be reused), To the number of code is 4x3x2 = 24! A selection of elements in which order matters (e.g. ab = ba is the same element) Example: Using the letters {a,b,c,d} how many 2 letter combinations can be made? The possible 2-letter permutations are ab,ac,ad,ba,bc,bd,ca,cb,cd,da,db,dc. There are 12 = 4x3 possible 2-letter permutations, but only 6 combinations! Problem 1: Given the set {v,w,x,y,z} how many 2 letter permutations can be made? How many three letter permutations can be made? Problem 2: Given the set {v,w,x,y,z} how many 2 letter combinations can be made? How many three letter combinations can be made?

13 Logical Reasoning A B Venn Diagram: A graphical representation of sets as intersection circles Example: Let A be the set of all even numbers, B be the set of perfect squares and C be powers of 2. Name two elements that could be in the shaded region. C Set A = {0,2,4,6,8,10,12, } Set B = {0,1,4,9,16,25,36,49,64,81,100, } Set C = {1,2,4,8,16,32,64,128, } The shaded region is the intersection of all three sets, so elements in the shaded region, must be in all three sets. Therefore possible answers are {4,16,64,256,1024, }. Problem 1: Using the diagram to the right, let A be the set of all odd numbers, B be the set of multiples of 6, and C be perfect squares. Of the following numbers, which are in the shaded region? 1, 9, 16, 36, 81, 216, 256, 512 A B C

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