4-5 Customary Measurements

Warm upUse your reference sheet

1. How many inches are in a foot?2. How many feet are in a mile?3. How many ounces equals a pound?4. 1 kilogram is how many grams?5. Bonus* How many ounces are in a gallon?

4-5 Customary Measurements

Weight of 3 applesPound (lb)

Weight of a buffaloTon

Amount of water in 2 tablespoonsFluid ounce (fl oz)Capacity

Capacity of a standard measuring cupCup (c)

Capacity of a large milk jugGallon (gal)

Weight of a slice of breadOunce (oz)Weight

Length of 4 laps around a trackMile (mi)

Length of a standard sheet of paperFoot (ft)

Length of a small paper clipInch (in.)Length

Customary Unit

You can use the following benchmarks to help you understand fluid ounces, tons, and other customary units of measure.

4-5 Customary Measurements

Additional Example 1: Choosing the Appropriate Customary Unit

Choose the most appropriate customary unit for each measurement. Justify your answer.

A. the weight of a cartons; The weight of a car is similar to the weight of a buffalo.

inches; The diameter of a soup can is similar to the length of a few paper clips.

pounds; The weight of a newborn baby is similar to the weight of more than a dozen apples.

B. the diameter of a soup can

C. the weight of a newborn baby

4-5 Customary Measurements

Check It Out: Example 1

Choose the most appropriate customary unit for each measurement. Justify your answer.

A. the length of a pen topinch; The length of a pen top is similar to the length of a small paper clip.

pounds; The weight of a pitcher of juice is similar to the weight of about 10 apples.

cups; The capacity of a jar of peanut butter is similar to the capacity of 2 standard measuring cups.

B. the weight of a pitcher of juice

C. the capacity of a jar of peanut butter

4-5 Customary Measurements

4-5 Customary Measurements

Additional Example 2: Converting Customary Units

Convert 5,000 pounds to tons.

Method 1: Use a proportion.

= pounds tons

2,000 1

Write a proportion using a ratio of equivalent measures.

2,000 • x = 1 • 5,000

2000x = 5,000

5,000 m x

x = 2.5

5,000 pounds is equal to 2.5 tons.

4-5 Customary Measurements

Check It Out: Example 2

Convert 24 pints to cups.

Method 1: Use a proportion.

= cups pints

2 1

Write a proportion using a ratio of equivalent measures.

1 • c = 2 • 24

c = 48

c 24

24 pints is equal to 48 cups.

4-5 Customary Measurements

Additional Example 3: Adding or Subtracting Mixed Units of Measure

Allison orders a 6-ounce grilled chicken sandwich. Dominic orders a quarter-pound grilled chicken sandwich. Which sandwich weighs more? Explain.

= ounces

pounds

16 1

First convert a quarter-pound to ounces.

x = 4 oz

x 0.25

Write a proportion using 16 oz = 1 lb.

Allison’s sandwich weighs more because Dominic’s sandwich is only 4 oz.

4-5 Customary Measurements

Check It Out: Example 3

Tedd and Fergie go the hardware store to purchase a bag of nails. Tedd buys a bag of nails that weighs 7 pounds 8 ounces. Fergie buys a bag of nails that weighs 128 ounces. Which bag of nails weighs more? Explain.

= ounces

pounds

16 1

First convert 7 pounds to ounces.

x = 112 oz + 8 oz

x 7

Write a proportion using 16 oz = 1 lb.

Fergie’s bag of nails weigh more because Tedd’s bag only weighs 120 oz.

x = 120 oz

4-5 Customary Measurements

Lesson Quiz: Part IChoose the most appropriate customary unit for each measurement. Justify your answer.

1. the capacity of a bathtub

2. the weight of a calculator

3. the length of an indoor sports arena

gallons; similar to the capacity of several large milk jugs

too small to measure in miles, so it should be measured in feet

ounces; similar to the weight of several slices of bread

4-5 Customary Measurements

Lesson Quiz: Part II

4. Convert 13 gallons to quarts.

5. Seth is returning from a 5-mile hike. He passes a

trail sign that says, “3,520 feet to base camp.”

How many more miles does Seth have to hike?

52

2 3

mi