210 Chapter 3 Fractions and Mixed Numbers: Addition and Subtraction Chapter 3 Summary Section 3.1 Addition and Subtraction of Like Fractions Examples Example 1 5 8 7 8 Example 2 25 10 7 10 12 8 18 10 3 12 82 9 18 10 5 3 2 9 5 Example 3 A nail that is in. long is driven through a board that is 11 8 in. thick. How much of the nail extends beyond the board? 13 8 11 8 2 8 13 8 1 4 The nail will extend in. 14 Key Concepts Adding Like Fractions 1. Add the numerators. 2. Write the sum over the common denominator. 3. Simplify the fraction to lowest terms, if possible. Subtracting Like Fractions 1. Subtract the numerators. 2. Write the difference over the common denominator. 3. Simplify the fraction to lowest terms, if possible. Example 3 is an application involving subtraction of like fractions.
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