ANSWERS TO YOU TRY EXERCISES 1) 28 32 2) a) 42 77 b) 3 45 3) LCD 15; 4 5 12 15 , 2 3 10 15 4) a) LCD 16; 5 8 10 16 , 9 16 already has the LCD b) LCD 100; 18 25 72 100 , 7 10 70 100 , 1 20 5 100 5) LCD 252; 59 84 177 252 , 41 126 82 252 4.3 Exercises Do the exercises, and check your work. Objective 1: Write a Fraction with a Different Denominator In Exercises 1–6, a fraction is given. Use the number lines below to identify its equivalent fraction(s). 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 8 2 8 3 8 4 8 5 8 6 8 7 8 6 2 6 3 6 4 6 5 6 4 2 4 3 4 3 2 3 2 1) 1 3 2) 3 4 3) 2 8 4) 4 6 5) 4 8 6) 1 2 Write each fraction with the indicated denominator. 7) 1 8 ? 32 8) 5 6 ? 18 9) 3 7 ? 28 10) 8 11 ? 66 11) 7 9 ? 27 12) 7 8 ? 48 13) 2 3 ? 36 14) 1 12 ? 60 15) 9 10 ? 70 16) 10 13 ? 26 17) 11 15 ? 45 18) 5 12 ? 84 19) 15 16 ? 96 20) 13 14 ? 168 Objective 2: Rewrite Fractions with the Least Common Denominator 21) What is the least common denominator of a group of fractions? 22) Dana says that the least common denominator of 5 8 and 1 6 is 48, but Inez says that it is 24. Who is right? Identify the least common denominator of the two given fractions. Then, write each as an equivalent fraction with the LCD as its denominator. 23) 4 7 and 3 14 24) 3 4 and 11 12 25) 4 5 and 2 15 26) 3 7 and 2 21 27) 3 8 and 5 12 28) 5 6 and 3 10 29) 7 8 and 5 6 30) 4 9 and 3 4 31) 31 54 and 2 9 32) 13 48 and 5 12 33) 7 12 and 3 20 34) 3 10 and 4 15 35) 15 38 and 4 19 36) 21 22 and 9 11 240 CHAPTER 4 Adding and Subtracting Fractions www.mhhe.com/messersmith
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