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Do Now Fraction W.S. DWP #3

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9/12/2013 SS-5 Measurement

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**Metric system - used almost everywhere in the world**

- Its advantage over the customary system related to decimals

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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

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Example 1 What unit of measure provides the best estimate? Justify your answer. A. A ballpoint pen is about 14 _____ long. A ballpoint pen is about 14 cm long. B. A football field is about 100 _____ long. A football field is about 100 m long.

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Example 2 A. A loaf of bread is about 3 _____ long. B. An earthworm is about 5 _____ long. A loaf of bread is about 3 dm long. An earthworm is about 5 cm long.

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**The line is between 3 and 4 meters. Closer to 4 m than 3 m.**

Example 7 Use the ruler to measure the length of the line to the nearest centimeter. 1 m The line is between 3 and 4 meters. Closer to 4 m than 3 m. The length of the line is about 4 m.

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**The line is between 1 and 2 meters. Closer to 1 m than 2 m.**

Example 8 1 m The line is between 1 and 2 meters. Closer to 1 m than 2 m. The length of the line is about 1 m.

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Your Turn!

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**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

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Customary Units

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**Customary system- the measurement system often used in the United States**

-includes units of measurement for length, weight, and capacity.

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**Customary Units of Length**

Four times around a track mi Mile Width of a classroom door yd Yard Distance from your elbow to your wrist ft Foot Width of your thumb in. Inch Benchmark Abbreviation Unit Customary Units of Length

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Example 1 What unit of measure provides the best estimate? A. A doorway is about 7 _____ high. B. A calculator is about 6 _____ long. A doorway is about 7 ft high. A calculator is about 6 in. long.

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Example 2 A. A 4-door sedan is about 5 _____ long. B. A student’s desk is about 3 _____ long. A 4-door sedan is about 5 yd long. A student’s desk is about 3 ft long.

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**The line segment is closest to 1 in. 5 8**

Example 7 Use the ruler to measure the length of the line segment to the nearest half, fourth, or eighth of an inch. The line segment is closest to 1 in. 5 8 The length of the line segment is about 1 in. 5 8

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**The line segment is between 1 and 1 in. 1 4 3 8**

Example 8 The line segment is between 1 and 1 in. 1 4 3 8 The length of the line segment is closest to 1 in. 1 4

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Your Turn!

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**What unit of measure provides the best estimate? **

1. A row boat is 10 _____ long. 2. A skateboard is 30 _____ long. 3. A pair or earphones weighs 4 _____. 4. Drinking water is delivered in 5 _____ bottle. 5. Estimate the length of the line segment to the nearest half, fourth, or eighth of an inch. ft in. oz gal 2 in.

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Homework Pg. 18 #1-12 All Study for Quiz Tomorrow

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**Measurement Scavenger Hunt**

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