# Understanding Customary Units of Measure

Learn about the customary system used in the US for length, weight, and capacity. Estimate measurements using benchmarks, such as inches for thumb width and yards for distance from elbow to wrist.

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## About Understanding Customary Units of Measure

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

2. Course 1 9-1 Understanding Customary Units of Measure 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

3. Course 1 9-1 Understanding Customary Units of Measure 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.

4. Course 1 9-1 Understanding Customary Units of Measure Check It Out: Example 1 What unit of measure provides the best estimate? Justify your answer. 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.

5. Course 1 9-1 Understanding Customary Units of Measure Customary Units of Weight Unit Abbreviation Benchmark Ounce oz A slice of bread Pound lb A loaf of bread Ton T A small car

6. Course 1 9-1 Understanding Customary Units of Measure Additional Example 2: Choosing Appropriate Units of Weight What unit of measure provides the best estimate? Justify your answer. 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.

7. Course 1 9-1 Understanding Customary Units of Measure Check It Out: Example 2 What unit of measure provides the best estimate? Justify your answer. 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.

8. Course 1 9-1 Understanding Customary Units of Measure Capacity deals with volume, or the amount a container can hold. Customary Units of Capacity Unit Abbreviation Benchmark 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

9. Course 1 9-1 Understanding Customary Units of Measure Additional Example 3: Choosing Appropriate Units of Capacity What unit of measure provides the best estimate? Justify your answer. 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.

10. Course 1 9-1 Understanding Customary Units of Measure Check It Out: Example 3 What unit of measure provides the best estimate? Justify your answer. 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.

11. Course 1 9-1 Understanding Customary Units of Measure 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

12. Course 1 9-1 Understanding Customary Units of Measure Check It Out: Example 4 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

13. Course 1 9-1 Understanding Customary Units of Measure Lesson Quiz 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