Fraction W.S.

DWP #3

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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 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

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.

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.

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

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

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 _____.

g

cm

L

kg

Customary Units

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

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

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

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.

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

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

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.

in.

ft

oz

gal

2 in.

1 2

Homework

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

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