154 Chapter 2 Fractions and Mixed Numbers: Multiplication and Division Section 2.4 Multiplication of Fractions and Applications Key Concepts Multiplication of Fractions To multiply fractions, write the product of the numerators over the product of the denominators. Then simplify the resulting fraction, if possible. When multiplying a whole number and a fraction, first write the whole number as a fraction by writing the whole number over 1. Powers of one-tenth can be expressed as a fraction with 1 in the numerator. The denominator has a 1 followed by the same number of zeros as the exponent of the base of The formula for the area of a triangle is given by h b A 12 1 10. bh. Area is expressed in square units such as ft2, in.2, yd2, m2, and cm2. Examples Example 1 4 7 Example 2 8 a5 6 b Example 3 a 1 10 4 b 8 4 1 3 5 63 1 10,000 Example 4 The area of the triangle is A 12 bh a1 7 1 41 4 2 7 2 4 16 71 b 16 7 The area is 4 m2. 20 3 a15 16 b a4 5 b 15 16 4 4 1 51 3 4 6 5 24 35 7 m 2 16 m 7
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