Do Now Fraction W.S. DWP #3

9/12/2013 SS-5 Measurement

Metric system - used almost everywhere in the world - Its advantage over the customary system related to decimals

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

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.

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.

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 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.

The line is between 1 and 2 meters. Closer to 1 m than 2 m. Example 8 1 m 2 3 4 The line is between 1 and 2 meters. Closer to 1 m than 2 m. The length of the line is about 1 m.

Your Turn!

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

Customary Units

Customary system- the measurement system often used in the United States -includes units of measurement for length, weight, and capacity.

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

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.

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.

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. 1 2 The line segment is closest to 1 in. 5 8 The length of the line segment is about 1 in. 5 8

The line segment is between 1 and 1 in. 1 4 3 8 Example 8 1 2 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

Your Turn!

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. 1 2

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

Measurement Scavenger Hunt