Warm Up Multiply the following by 1,000. 1. 0.03 2. 4.02 Divide the following by 1,000. 3. 30 4. 487.1 30 4,020 0.03 0.4871

Problem of the Day James said he was 5 ft 6 in. tall. His brother’s height is 65 in. Who is the tallest and by how much? James, by 1 in.

Learn to understand and select appropriate metric units of measure.

Vocabulary metric system

The metric system of measurement is used almost everywhere in the world. Its advantage over the customary system is that all metric units are related by the decimal system. Kilometer Meter Decimeter Centimeter Millimeter Unit Width of a single bed 1 m m Distance around a city block 1,000 m km Width of CD case 0.1 m dm Width of a fingernail 0.01 m cm Thickness of a dime 0.001 m mm Benchmark Relation to a Meter Abbreviation Metric Units of Length

Additional Example 1: Choosing Appropriate Units of Length What unit of measure provides the best estimate? Justify your answer. A. A ballpoint pen is about 14 _____ long. Think: A ballpoint pen is about 14 times the width of a fingernail. A ballpoint pen is about 14 cm long. B. A football field is about 100 _____ long. Think: A football field is about 100 times the width of a single bed. A football field is about 100 m long.

Kilogram Gram Milligram Unit Textbook 1,000 g kg Paper clip 1 g g Very small insect 0.001 g mg Benchmark Relation to a Gram Abbreviation Metric Units of Mass

Additional Example 2: Choosing Appropriate Units of Mass What unit of measure provides the best estimate? Justify your answer. An orange has a mass of about 600 _____ . Think: An orange has a mass of about 600 times the mass of a large paperclip. An orange has a mass of about 600 g.

Metric Units of Capacity Liter Milliliter Unit Water pitcher 1 L L Drop of water 0.001 L mL Benchmark Relation to a Liter Abbreviation Metric Units of Capacity

Additional Example 3: Choosing Appropriate Units of Capacity What unit of measure provides the best estimate? Justify your answer. An ice cream scoop holds about 100 _____ . Think: An ice cream scoop holds the capacity of about 100 times a drop of water. An ice cream scoop holds about 100 mL.

Additional Example 4: Finding Measurements Use the ruler to measure the length of the line to the nearest centimeter. 1 m 2 3 4 The line is between 3 and 4 meters. Closer to 4 m than 3 m. The length of the line is about 4 m.

Lesson Quiz Name the most appropriate unit of measure. 1. A door knob has a diameter of about 7 _____. 2. A ballpoint pen weighs about 3 _____. 3. A gallon of milk is almost 4 _____. 4. Paul estimated the weight of his infant sister to t be 5 _____. cm g L kg

Lesson Quiz for Student Response Systems 1. Identify the most appropriate unit of measure. The wheel of a bicycle has a diameter of about 60 ___. A. mm B. cm C. m D. km

Lesson Quiz for Student Response Systems 2. Identify the most appropriate unit of measure. An adult rabbit weighs about 1 __. A. mg B. g C. kg D. L

Lesson Quiz for Student Response Systems 3. Identify the most appropriate unit of measure. A teapot has a capacity of almost 2 ___. A. ml B. g C. L D. kg

Lesson Quiz for Student Response Systems 4. Brian estimated the weight of a baseball bat to be 1 ___. A. ml B. g C. L D. kg