We can also add fractions vertically. Add the fractions vertically. a) 3 8 2 7 b) 8 15 11 20 Solution a) Identify the LCD of 3 8 and 2 7 . b) Identify the LCD of 8 15 and 11 20 . LCD 56 LCD 60 3 8 2 7 3 8 Write as equivalent fractions. 7 7 2 7 8 8 T 21 56 16 56 37 56 8 15 11 20 8 15 Write as equivalent fractions. 4 4 11 20 3 3 T 32 60 33 60 65 60 Ask yourself, “Is 37 56 in lowest terms?” Ask yourself, “Is 65 60 in lowest terms?” Yes. The fi nal answer is 37 56 . No! Write it in lowest terms. 65 60 65 5 60 5 13 12 or 1 1 12 EXAMPLE 3 Does adding fractions vertically appear to be more seamless? YOU TRY 3 Add the fractions vertically. a) 3 8 6 11 b) 4 15 9 10 2 Subtract Unlike Fractions We must write fractions with their least common denominator before subtracting them. Subtract. a) 9 10 2 5 b) 7 9 5 12 Solution a) Step 1: Write down the LCD of 9 10 and 2 5 . LCD 10 Step 2: Rewrite each fraction with the LCD. 9 10 already has the LCD. 2 5 2 2 4 10 EXAMPLE 4 246 CHAPTER 4 Adding and Subtracting Fractions www.mhhe.com/messersmith
messersmith_power_basic_college_1e_ch4_7_10
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