Find the length of the paper clip in the indicated unit. 0 cm1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 a) mm b) cm Solution a) Each of the smallest marks on the ruler is a millimeter. Each of the larger marks on the ruler is a centimeter. Remember, 1 cm 10 mm, so we can begin by counting the 10 millimeters in each centimeter. Then, count the individual millimeters. 10 mm 1 10 mm 1 10 mm 1 10 mm 1 6 mm 5 46 mm 0 cm1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 The length of the paper clip is 46 mm. b) To measure the paper clip in centimeters, think of the ruler in terms of centimeters. Each of the larger marks on the ruler is a centimeter. Since it takes 10 mm to make a centimeter, each smaller mark, or millimeter, is 1 10 cm or 0.1 cm. Count the 4 cm, then count the additional 6 mm or 0.6 cm. 4 cm 1 0.6 cm 5 4.6 cm 0 cm1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 The length of the paper clip is 4.6 cm. EXAMPLE 2 YOU TRY 2 Find the length of the nail clippers in the indicated unit. 0 cm1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 a) mm b) cm www.mhhe.com/messersmith SECTION 7.2 The Metric System: Length 581
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