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Fraction W.S.
DWP #3
Do Now
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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 bed1 mm
Distance around a city block
1,000 mkm
Width of CD case0.1 mdm
Width of a fingernail0.01 mcm
Thickness of a dime0.001 mmm
BenchmarkRelation 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.
A football field is about 100 m long.
B. A football field is about 100 _____ 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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Example 7
Use the ruler to measure the length of the line to the nearest centimeter.
The line is between 3 and 4 meters. Closer to 4 m than 3 m.
The length of the line is about 4 m.
3 41 m 2
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Example 8
The line is between 1 and 2 meters. Closer to 1 m than 2 m.
The length of the line is about 1 m.
1 m 2 3 4
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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 _____.
g
cm
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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Four times around a trackmiMile
Width of a classroom doorydYard
Distance from your elbow to your wristftFoot
Width of your thumbin.Inch
BenchmarkAbbreviationUnit
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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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
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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
Example 8
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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.
in.
ft
oz
gal
2 in.
1 2
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Homework
• Pg. 18 #1-12 All• Study for Quiz Tomorrow
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Measurement Scavenger Hunt