tailieunhanh - Sat - MC Grawhill part 30

This book boasts a large number of practice tests which is infintely helpful. Finally, the essay section gives much good insight. | 280 McGRAW-HILL S SAT SAT Practice 3 Fractions 1. If 4 quarts of apple juice are mixed with 5 quarts of cranberry juice and 3 quarts of grape juice what part of the total mixture is apple juice m n 7. If --- then m 2 n 4 2 8 7 7 A 7 B 7 C 5 D 7 E 14 A 1 B 4 C 3 4 2 D 4 E 3 2. For what value of y does -3 y A -3 B -1 C 3 D 3 E 6 3. Which of the following is greatest 2 .2 .2 A 2 X1 B 1 - 3 C 1 3 22 2 D 2 2 E 2 1 1 4. If 5 then x 112 A 110 B 5 C 5 D 5 E 10 8. If z 0 which of the following is equivalent S z z A 1 B é C 2 2z z D E 9. Five-eighths of Ms. Talbott s students are boys and two-thirds of the girls do not have dark hair. What fraction of Ms. Talbott s students are girls with dark hair A 24 B .0 C 1 D 1 E 1 1 2 10. If - - then x 3 7 6 3 6 x 5. If 1 1 5 then m 2 m 6 A 1 3 B 2 5 C 2 3 D 3 E 5 6. If x y and x y 0 then x y A D -1 1 B E 0 2 C 122 11. If n 1 and nx 1 then x m x A m m B m C m 1 n-1 n 1 n D m 1 m 1 n -1 E m T n 1 CHAPTER 7 ESSENTIAL PRE-ALGEBRA SKILLS 281 Answer Key 3 Fractions Concept Review 3 1. 19 35 Use zip-zap-zup it s better than using your calculator 2. 20 3 Change to 5 2 X 8 3. 3. 8 3 Divide numerator and denominator by their common factor 7. 4. 8 45 Change to 2 9 X 4 5. 5. 12x 14 21x Use zip-zap-zup. 6. 4x 3z Change to 3x 2 X 8 9z and simplify. 7. 3m 1 2m 1 Factor and cancel 4 from the numerator and denominator. 8. -1 6x Change to -2 9x2 X 3x 4 and simplify. 9. 13 12 Change to 6 12 4 12 3 12. 10. 3 - 2x 4 Use zip-zap-zup and simplify. 11. x 5 As long as x 5. Factor as x z 5 x 5 x - 5 and cancel the common factor. For factoring review see Chapter 8 Lesson 5. SAT Practice 3 1. C 4 4 5 3 4 12 1 3 2. B 1 -3 y Multiply by y 1 -3y Divide by -3 -1 y 2 3. C X 1 . 3 1 - 2 3 - 2 1 . 3 3 3 3 1 - 2 1X 3 32 2 2 2 3 6 - -t3 -X22- 1 3 3 3 2 6 2 1 2X1 . 33 1 _ 1 4. A 5 Multiply by x J- 5x x2 Multiply by 1 J2 x 12. 2n 3 4n Divide numerator and denominator by the common factor 3. Don t forget to distribute the division in the numerator