New SAT Math Workbook

New SAT Math Workbook

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Unformatted text preview: f the digits is 27, which is divisible by 3. The number formed by the last two digits is 40, which is divisible by 4. The number ends in 0 and is therefore divisible by 5. Exercise 5 1. 2. (C) 26 = 5 15 15 = 3 15 2. (A) To compare (A), (B), (C), and (D), use a common denominator of 24. 3 18 = 4 24 5 20 = 6 24 7 21 = 8 24 19 24 3. Of these, with 3 3 is the smallest. To compare 4 4 13 , use cross products. Since (3)(15) < 15 3 13 (4)(14), < . Therefore, (A) is the smallest. 4 15 3. 4. 5. (D) To compare (A), (B), (D), and (E), use a common denominator of 20. 3 12 = 5 20 7 14 = 10 20 3 15 = 4 20 13 20 Of these, 3 3 is the largest. To compare with 4 4 5 3 , use cross products. Since (3)(8) > (4)(5), 8 4 Exercise 4 1. (C) 1 = 1 1 2 6 12 8 2 2 =2 3 12 3 9 3 =3 4 12 19 7 6 =7 12 12 12 = 60 12 5 5 45 = 45 12 12 7 15 12 13 13 is the larger fraction. 4. (E) Use a common denominator of 24. 1 12 = 2 24 19 24 7 14 = 12 24 5 20 = 6 24 11 22 = 12 24 Since 19 . 24 3 18 3 = , the answer closest to is (E), 4 24 4 2. (A) 61 5. (D) Use a common denominator of 60. 5 25 = 12 60 7 28 = 15 60 8 32 = 15 60 11 33 = 20 60 31 60 3. 65 26 (C) ⋅ = 169 25 Since 4. (A) 17 ÷ 70 = 3 1 30 1 = , the answer closest to is (D), 2 60 2 1 2 35 35 1 1 ÷ 70 = ⋅ = 2 2 70 4 2 31 . 60 5. (E) 5 1 7 12 5 ⋅ ⋅ = =2 2 4 1 42 2 6 2 www.petersons.com Operations with Fractions 37 Exercise 6 1. (A) Multiply every term of the fraction by 12. 8 + 2 + 3 13 = 8−6 2 Retest 1. (B) Rename all fractions as sixtieths. 48 45 20 113 + + = 60 60 60 60 2. (C) Multiply every term of the fraction by 12. 10 − 8 2 = 5− 2 3 2. 3. (D) 11 2 11 10 1 -= - = 15 3 15 15 15 3. 11 + 23 (B) 1 Multiply every term by 6. 6 3+ 2 =5 1 (D) The sum of the digits must be divisible by 9. 5 + 2 + 3 + 4 + 4 = 18, which is divisible by 9. (E) 1 4. 17 34 ÷ 20 15 3 17 1 4. (A) 1 2 =2 1 1 3 =3 1 1 6 20 34 ⋅ 15 2 = 3 8 =6 4 5. (A) 100 = 99 2+3 5 = 6 6 7 3 3 3 2 2 – 62 = 62 3 3 1 37 3 1 2 5. (E) 11 10 Multiply every term by 6. 23 14 14 = 33 + 20 53 + 6. 7. 12 48 12 10 2 1 (B) 5 ÷ 10 =...
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This note was uploaded on 08/15/2010 for the course MATH a4d4 taught by Professor Colon during the Spring '10 term at Embry-Riddle FL/AZ.

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