Step 3: Subtract. These fractions are equivalent. Step 4: Ask yourself, “Is The fi nal answer is b) Step 1: Write down the LCD of Step 2: Rewrite each fraction with the LCD. Step 3: Subtract. Equivalent fractions Equivalent fractions Step 4: Ask yourself, “Is Are you writing out the steps in the examples as you are reading them? YOU TRY 4 Subtract. a) 11 12 3 4 b) 1 2 5 6 9 10 5 10 7 9 13 36 2 7 2 5 in lowest terms?” No! Write it in lowest terms. . 7 9 4 4 5 12 in lowest terms?” Yes. We can subtract fractions vertically. 9 10 4 10 9 4 10 5 10 5 10 5 5 10 5 1 2 7 9 and 5 12 . LCD 36 28 36 5 12 3 3 15 36 28 36 15 36 28 15 36 13 36 Subtract 8 11 3 7 vertically. Solution Identify the LCD of 8 11 and 3 7 . LCD 77 8 11 3 7 Write as equivalent fractions. 8 11 7 7 3 7 11 11 T 56 77 33 77 23 77 Ask yourself, “Is 23 77 in lowest terms?” Yes. The fi nal answer is 23 77 . EXAMPLE 5 www.mhhe.com/messersmith SECTION 4.4 Adding and Subtracting Unlike Fractions 247
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