Why is it called U.S Customary Units of Weight?

Because units change in every country in the world. For example, in Japan, people don't use inches!

how do I know if I need to multiply or dived?

To convert "bigger" units to "smaller" ones, you multiply. To convert "smaller" to bigger, you divide. Pound is something big, and ounce is something small - smaller parts make one big thing - 16 ounces are in a pound. To convert pounds to ounces, you multiply by 16. To convert ounces to pounds, you divide by 16.

how does 8tons = 16000

bc 8 times 2 is 16 and then you just add the 3 zeros.

Why is it called U.S Customary Units of Weight?

its because the U.S is the only country that still uses the customary system

how many inches are in a mile?

There are 5280 feet in a mile and there are 12 inches in a foot. I'll leave it up to you to calculate the rest.

What is the difference between weight and mass?

Weight and mass are used interchangeably, but they don't mean the same thing. Mass is the amount of matter in an object, while weight is the force of gravity by which the earth attracts towards it. So your mass on Jupiter and Earth would be the same, but your weight would be different. But in math levels right now, you can use them interchangeably.

Main content

5th grade

Unit 14: Lesson 4

Converting US Customary units

US Customary units of weight review (oz & lb)

CCSS.Math:

4.MD.A.1

5.MD.A.1

Google Classroom

Review the size of ounces and pounds and how to convert between the two. Then, try some practice problems.

Customary units of weight

Weight is a quantity of heaviness. For example, you are measuring the weight of your body when you step on to a scale.

In the customary system of measurement, the most common units of weight are the ounce (oz) and pound (lb).

How much is an ounce?

A slice of bread has a weight of about 1 ounce:

How much is a pound?

A soccer ball has a weight of about 1 pound:

Want to learn more about customary units of weight? Check out this video.

Practice set 1: Estimating weight

Problem 1A

Identify the most reasonable unit to measure the weight of a refrigerator.

Want to try more problems like this? Check out this exercise.

Converting pounds to ounces

1, start text, space, p, o, u, n, d, end text, equals, start color #28ae7b, 16, end color #28ae7b, start text, space, o, u, n, c, e, s, end text

To convert pounds to ounces we multiply the number of pounds by start color #1fab54, 16, end color #1fab54.

Example:

start color #ff00af, 30, end color #ff00af, start text, space, p, o, u, n, d, s, end text, equals, start color #ff00af, 30, end color #ff00af, times, start color #28ae7b, 16, end color #28ae7b, equals, start color #6495ed, 480, end color #6495ed, start text, space, o, u, n, c, e, s, end text

Converting ounces to pounds

1, start text, space, o, u, n, c, e, end text, equals, start fraction, 1, divided by, start color #28ae7b, 16, end color #28ae7b, end fraction, start text, space, p, o, u, n, d, end text

To convert ounces to pounds we divide the number of ounces by start color #1fab54, 16, end color #1fab54.

Example:

start color #ff00af, 112, end color #ff00af, start text, space, o, u, n, c, e, s, end text, equals, start fraction, start color #ff00af, 112, end color #ff00af, divided by, start color #28ae7b, 16, end color #28ae7b, end fraction, equals, start color #ff00af, 112, end color #ff00af, divided by, start color #28ae7b, 16, end color #28ae7b, equals, start color #6495ed, 7, end color #6495ed, start text, space, p, o, u, n, d, s, end text

Want to learn more about converting pounds to ounces? Check out this video.

Practice set 2: Converting units of weight

Problem 2A

Convert.

9 pounds equals

ounces

Want to try more problems like this? Check out these exercises:
Convert larger units to smaller units
Converting between units

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Welcome back Mallory!
Posted 3 years ago. Direct link to Welcome back Mallory!'s post “how do I know if I need t...”
how do I know if I need to multiply or dived?
(3 votes)
Answer
- Slaga Lika
  Posted 3 years ago. Direct link to Slaga Lika's post “To convert "bigger" units...”
  To convert "bigger" units to "smaller" ones, you multiply.
  To convert "smaller" to bigger, you divide.
  Pound is something big, and ounce is something small - smaller parts make one big thing - 16 ounces are in a pound.
  To convert pounds to ounces, you multiply by 16.
  To convert ounces to pounds, you divide by 16.
  (10 votes)
AlinaR
Posted 3 years ago. Direct link to AlinaR's post “how many ounces in a poun...”
how many ounces in a pound? I am braindead:/
(4 votes)
Answer
sturtza697
Posted 3 years ago. Direct link to sturtza697's post “Why is it called U.S Cust...”
Why is it called U.S Customary Units of Weight?
(4 votes)
Answer
- Maya
  Posted 23 days ago. Direct link to Maya's post “Because units change in e...”
  Because units change in every country in the world. For example, in Japan, people don't use inches!
  (3 votes)
RobloxianIzzy {Currently online}
Posted 4 years ago. Direct link to RobloxianIzzy {Currently online}'s post “Seems like most of you ar...”
Seems like most of you are with me. I din't get this either. =(
(4 votes)
Answer
295071
Posted 5 years ago. Direct link to 295071's post “how does 8tons = 16000”
how does 8tons = 16000
(2 votes)
Answer
- Alice Elaine Offord
  Posted 5 years ago. Direct link to Alice Elaine Offord's post “bc 8 times 2 is 16 and th...”
  bc 8 times 2 is 16 and then you just add the 3 zeros.
  (2 votes)
S@ur@b
Posted 4 years ago. Direct link to S@ur@b's post “how to find the scientifi...”
how to find the scientific notation
(4 votes)
Answer
sturtza697
Posted 3 years ago. Direct link to sturtza697's post “Why is it called U.S Cust...”
Why is it called U.S Customary Units of Weight?
(2 votes)
Answer
- Tristyn Wegrzynowski
  Posted a year ago. Direct link to Tristyn Wegrzynowski's post “its because the U.S is th...”
  its because the U.S is the only country that still uses the customary system
  (3 votes)
Jax.Beavers
Posted 2 months ago. Direct link to Jax.Beavers's post “55+55=?”
55+55=?
(3 votes)
Answer
- WisteriaGrove
  Posted 20 days ago. Direct link to WisteriaGrove's post “the answer is 110”
  the answer is 110
  (1 vote)
floraredberry
Posted 7 months ago. Direct link to floraredberry's post “What is the difference be...”
What is the difference between weight and mass?
(1 vote)
Answer
- Shall Win
  Posted 7 months ago. Direct link to Shall Win's post “Weight and mass are used ...”
  Weight and mass are used interchangeably, but they don't mean the same thing.
  Mass is the amount of matter in an object, while weight is the force of gravity by which the earth attracts towards it.
  
  So your mass on Jupiter and Earth would be the same, but your weight would be different. But in math levels right now, you can use them interchangeably.
  (5 votes)
27olivis
Posted 3 years ago. Direct link to 27olivis's post “how many inches are in a ...”
how many inches are in a mile?
(2 votes)
Answer
- Stephen White
  Posted 3 years ago. Direct link to Stephen White's post “There are 5280 feet in a ...”
  There are 5280 feet in a mile and there are 12 inches in a foot. I'll leave it up to you to calculate the rest.
  (2 votes)