1. Warm up Use your reference sheet
How many inches are in a foot?
How many feet are in a mile?
How many ounces equals a pound?
1 kilogram is how many grams?
Bonus* How many ounces are in a gallon?

2. You can use the following benchmarks to help you understand fluid ounces, tons, and other customary units of measure.
Weight of 3 apples
Pound (lb)
Weight of a buffalo
Ton
Amount of water in 2 tablespoons
Fluid ounce (fl oz)
Capacity
Capacity of a standard measuring cup
Cup (c)
Capacity of a large milk jug
Gallon (gal)
Weight of a slice of bread
Ounce (oz)
Weight
Length of 4 laps around a track
Mile (mi)
Length of a standard sheet of paper
Foot (ft)
Length of a small paper clip
Inch (in.)
Length
Customary Unit

3. 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 car
tons; The weight of a car is similar to the weight of a buffalo.
B. the diameter of a soup can
inches; The diameter of a soup can is similar to the length of a few paper clips.
C. the weight of a newborn baby
pounds; The weight of a newborn baby is similar to the weight of more than a dozen apples.

4. Check It Out: Example 1
Choose the most appropriate customary unit for each measurement. Justify your answer.
A. the length of a pen top
inch; The length of a pen top is similar to the length of a small paper clip.
B. the weight of a pitcher of juice
pounds; The weight of a pitcher of juice is similar to the weight of about 10 apples.
C. the capacity of a jar of peanut butter
cups; The capacity of a jar of peanut butter is similar to the capacity of 2 standard measuring cups.

6. Additional Example 2: Converting Customary Units
Convert 5,000 pounds to tons.
Method 1: Use a proportion.
Write a proportion using a ratio of equivalent measures.
pounds tons
2,000 1
5, m x =
2,000 • x = 1 • 5,000
2000x = 5,000
x = 2.5
5,000 pounds is equal to 2.5 tons.

7. Check It Out: Example 2
Convert 24 pints to cups.
Method 1: Use a proportion.
Write a proportion using a ratio of equivalent measures.
cups pints
2 1
c 24 =
1 • c = 2 • 24
c = 48
24 pints is equal to 48 cups.

8. 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.
First convert a quarter-pound to ounces.
ounces pounds
16 1 x
Write a proportion using 16 oz = 1 lb. =
x = 4 oz
Allison’s sandwich weighs more because Dominic’s sandwich is only 4 oz.

9. 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.
First convert 7 pounds to ounces.
ounces pounds
16 1
x 7
Write a proportion using 16 oz = 1 lb. =
x = 112 oz + 8 oz
x = 120 oz
Fergie’s bag of nails weigh more because Tedd’s bag only weighs 120 oz.

10. Lesson Quiz: Part I
Choose 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
ounces; similar to the weight of several slices of bread
too small to measure in miles, so it should be measured in feet

11. 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