3Metric system - used almost everywhere in the world - Its advantage over the customary system related to decimals
4KilometerMeterDecimeterCentimeterMillimeterUnitWidth of a single bed1 mmDistance around a city block1,000 mkmWidth of CD case0.1 mdmWidth of a fingernail0.01 mcmThickness of a dime0.001 mmmBenchmarkRelation to a MeterAbbreviationMetric Units of Length
5Example 1What 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.
6Example 2A. 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.
7The line is between 3 and 4 meters. Closer to 4 m than 3 m. Example 7Use the ruler to measure the length of the line to the nearest centimeter.1 mThe line is between 3 and 4 meters. Closer to 4 m than 3 m.The length of the line is about 4 m.
8The line is between 1 and 2 meters. Closer to 1 m than 2 m. Example 81 mThe line is between 1 and 2 meters. Closer to 1 m than 2 m.The length of the line is about 1 m.
10Name 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 _____.cmgLkg
12Customary system- the measurement system often used in the United States -includes units of measurement for length, weight, and capacity.
13Customary Units of Length Four times around a trackmiMileWidth of a classroom doorydYardDistance from your elbow to your wristftFootWidth of your thumbin.InchBenchmarkAbbreviationUnitCustomary Units of Length
14Example 1What 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.
15Example 2A. 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.
16The line segment is closest to 1 in. 5 8 Example 7Use 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 8The length of the line segment is about 1 in.5 8
17The line segment is between 1 and 1 in. 1 4 3 8 Example 8The line segment is between 1 and 1 in.1 43 8The length of the line segment is closest to 1 in.1 4
19What 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.ftin.ozgal2 in.