9-1 Understanding CustomaryUnits of Measure

Warm UpWarm Up

Lesson PresentationLesson Presentation

Problem of the DayProblem of the Day

Lesson QuizzesLesson Quizzes

9-1 Understanding CustomaryUnits of Measure

Warm UpSimplify.

1.

3.

2.

4.

14

38

12

34

9-1 Understanding CustomaryUnits of Measure

Problem of the Day

Maria rented an electric car at a rate of $40 per day and $0.15 per mile. She returned the car the same day, gave the rental clerk a $100 bill, and got $21.75 back in change. How far did Maria drive the car?255 miles

9-1 Understanding CustomaryUnits of Measure

Learn to understand and select appropriate customary units of measure.

9-1 Understanding CustomaryUnits of Measure

Vocabulary

customary system

9-1 Understanding CustomaryUnits 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.

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

9-1 Understanding CustomaryUnits of Measure

Additional Example 1: Choosing Appropriate Units of Length

What unit of measure provides the best estimate?

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.

9-1 Understanding CustomaryUnits of Measure

Check It Out: Example 1

What unit of measure provides the best estimate?

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

B. A student’s 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 5 yd long.

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

A student’s desk is about 3 ft long.

9-1 Understanding CustomaryUnits of Measure

A small carTTon

A loaf of breadlbPound

A slice of breadozOunce

BenchmarkAbbreviationUnit

Customary Units of Weight

9-1 Understanding CustomaryUnits of Measure

Additional Example 2: Choosing Appropriate Units of Weight

What unit of measure provides the best estimate?

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.

9-1 Understanding CustomaryUnits of Measure

Check It Out: Example 2

What unit of measure provides the best estimate?

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.

9-1 Understanding CustomaryUnits of Measure

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

A small container of paintqtQuart

A large container of milkgalGallon

A small bottle of salad dressingptPint

A glass of juicecCup

A spoonfulfl ozFluid ounce

BenchmarkAbbreviationUnit

Customary Units of Capacity

9-1 Understanding CustomaryUnits of Measure

Additional Example 3: Choosing Appropriate Units of Capacity

What unit of measure provides the best estimate?

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.

9-1 Understanding CustomaryUnits of Measure

Check It Out: Example 3

What unit of measure provides the best estimate?

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.

9-1 Understanding CustomaryUnits of Measure

Additional Example 4: Estimating Measurements

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

9-1 Understanding CustomaryUnits of Measure

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

Check It Out: Example 4

Use the ruler to measure the length of the line segment to the nearest half, fourth, or eighth of an inch.

9-1 Understanding CustomaryUnits of Measure

Standard Lesson Quiz

Lesson Quizzes

Lesson Quiz for Student Response Systems

9-1 Understanding CustomaryUnits of Measure

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

9-1 Understanding CustomaryUnits of Measure

1. What unit of measure provides the best estimate? A door is about 7 ___ tall.

A. in. B. ft

C. yd D. mi

Lesson Quiz for Student Response Systems

9-1 Understanding CustomaryUnits of Measure

2. What unit of measure provides the best estimate? A shoe is about 12 ___ long.

A. in. B. ft

C. yd D. mi

Lesson Quiz for Student Response Systems

9-1 Understanding CustomaryUnits of Measure

3. What unit of measure provides the best estimate? An adult cat weighs 8 ___.

A. oz. B. lb

C. T D. gal

Lesson Quiz for Student Response Systems

9-1 Understanding CustomaryUnits of Measure

4. What unit of measure provides the best estimate? A carton of milk in the cafeteria contains 1 ___.

A. fl oz. B. qt

C. c D. gal

Lesson Quiz for Student Response Systems

9-1 Understanding CustomaryUnits of Measure

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

A. B.

C. D.

Lesson Quiz for Student Response Systems