b) Step 1: Write down the LCD of 6 7 and 2 9 . LCD 63 Step 2: Rewrite each fraction with the LCD. 6 7 9 9 54 63 2 9 7 7 14 63 Step 3: Add. Equivalent fractions 6 7 2 9 54 63 14 63 54 14 63 68 63 or 1 5 63 Equivalent fractions Step 4: Ask yourself, “Are 68 63 and 1 5 63 in lowest terms?” Yes. The fi nal answer is 68 63 or 1 5 63 . Remember, the fi nal answer may be written as an improper fraction or as a mixed number. c) Step 1: Write down the LCD of 2 15 , 1 6 , and 3 10 . LCD 30 Step 2: Rewrite each fraction with the LCD. 2 15 2 2 4 30 1 6 5 5 5 30 3 10 3 3 9 30 Step 3: Add. Equivalent fractions 2 15 1 6 3 10 4 30 5 30 9 30 4 5 9 30 18 30 Equivalent Equivalent fractions fractions Step 4: Ask yourself, “Is 18 30 in lowest terms?” No! Write it in lowest terms. 18 30 18 6 30 6 3 5 The fi nal answer is 3 5 . YOU TRY 2 Add. a) 4 9 2 6 b) 5 9 5 8 c) 1 10 7 15 1 4 www.mhhe.com/messersmith SECTION 4.4 Adding and Subtracting Unlike Fractions 245
messersmith_power_basic_college_1e_ch4_7_10
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