Course 1 9-1 Understanding Customary Units of Measure Vocabulary customary system.

Course 1

9-1Understanding CustomaryUnits of Measure

Vocabulary

customary system

Course 1


If you do not have an instrument, such as a ruler, scale, or measuring cup, you can estimate the length, weight, and capacity of an object by using a benchmark. The customary system is the measurement system often used in the United States. It includes units of measurement for length, weight, and capacity.

Customary Units of Length

Unit Abbreviation Benchmark

Inch in. Width of your thumb

Foot ft Distance from your elbow to your wrist

Yard yd Width of a classroom door

mile mi Total length of 18 football fields

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Additional Example 1: Choosing Appropriate Units of Length

What unit of measure provides the best estimate? Justify your answer.

A. A doorway is about 7 _____ high.

B. A calculator is about 6 _____ long.

Think: The height of a doorway is about 7 times the distance from your elbow to your wrist.A doorway is about 7 ft high.

Think: The length of a calculator is about 6 times the width of your thumb.

A calculator is about 6 in. long.

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Check It Out: Example 1


A. A 4-door sedan is about 5 _____ long.

B. A students desk is about 3 _____ long.

Think: The length of a sedan is about 5 times the width of a classroom door.

A 4-door sedan is about 8 yd long.

Think: The length of a students desk is about 3 times the distance from your elbow to your wrist.

A students desk is about 4 ft long.

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Customary Units of Weight


Ounce oz A slice of bread

Pound lb A loaf of bread

Ton T A small car

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Additional Example 2: Choosing Appropriate Units of Weight


A. A loaf of bread weighs about 16 _____ .

B. A bike could weigh 20 _____ .

Think: A loaf of bread has a weight of about 16 slices of bread.A loaf of bread weighs about 16 oz.

Think: A bike could have a weight of about 20 loaves of bread.

A bike could weigh 20 lbs.

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A. A black rhino could weigh about 1 _____ .

B. A DVD remote control weighs about 8 ____ .

Think: A black rhino has a weight of about a small car.A black rhino can weigh about 1 T.

Think: A DVD remote control has a weight of about 8 slices of bread .

A DVD remote control weighs about 8 oz.

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Capacity deals with volume, or the amount a container can hold.

Customary Units of Capacity


Fluid ounce fl oz A spoonful

Cup c A glass of juice

Pint pt A small bottle of salad dressing

Quart qt A small container of paint

Gallon gal A large container of milk

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Additional Example 3: Choosing Appropriate Units of Capacity


A large water cooler holds about 10 _____ t of water.

Think: A large water cooler holds 10 times the amount of a large container of milk.

A large water cooler holds about 10 gal of water.

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A small fish aquarium holds about 20 _____ t of water.

Think: A small fish aquarium holds 20 times the amount of a small container of paint.

A small fish aquarium holds about 20 qt of water.

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Additional Example 4: Estimating Measurements

Estimate 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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Estimate the length of the line segment to the nearest half, fourth, or eighth of an inch.

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

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Lesson QuizWhat 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

Course 1 9-1 Understanding Customary Units of Measure Vocabulary customary system.

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