Now let’s look closely at a meterstick to see how the meter, decimeter, centimeter, and millimeter are related. 0 1 2 3 4 5 6 7 8 9 10 1 dm mm cm The meterstick above shows us the following relationships: Relationships Between Metric Units of Length 10 decimeters 1 meter 100 centimeters 1 meter 1000 millimeters 1 meter 10 millimeters 1 centimeter 10 centimeters 1 decimeter Let’s practice deciding which metric unit is appropriate for measuring a particular length. Fill in the blank with the appropriate metric unit. Use km, m, cm, or mm. a) A pen is 14 long. b) Gisele drives 8 to work every day. c) The lens of a camera on a phone is 3 wide. d) The length of a soccer fi eld is 72 . Solution a) A pen is 14 cm long. (This is about 5.5 in.) Usually, we use centimeters instead of inches. b) Gisele drives 8 km to work everyday. (8 km 5 mi) Kilometers are used instead of miles. c) The lens of a camera on a phone is 3 mm wide. (3 mm 0.12 in.) d) The length of a soccer fi eld is 72 m. (This is about 78.74 yd.) Usually, we use meters instead of yards. EXAMPLE 1 YOU TRY 1 Fill in the blank with the appropriate metric unit. Use km, m, cm, or mm. a) The width of a bedroom is 4.5 . b) A computer screen is 33 wide. c) Boston and New York City are approximately 306 apart. d) An ant is 5 long. www.mhhe.com/messersmith SECTION 7.2 The Metric System: Length 447
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