Main content

### Course: 5th grade > Unit 14

Lesson 4: Converting US Customary units# US Customary units of weight review (oz & lb)

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.*

## Converting pounds to ounces

To convert pounds to ounces we multiply the number of pounds by ${16}$ .

**Example:**

## Converting ounces to pounds

To convert ounces to pounds we divide the number of ounces by ${16}$ .

**Example:**

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

## Practice set 2: Converting units of weight

*Want to try more problems like this? Check out these exercises:*

Convert larger units to smaller units

Converting between units

## Want to join the conversation?

- how does 8tons = 16000(19 votes)
- bc 8 times 2 is 16 and then you just add the 3 zeros.(17 votes)

- how do I know if I need to multiply or dived?(7 votes)
- 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.(21 votes)

- What is the difference between weight and mass?(3 votes)
- 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.(12 votes)

- Why is it called U.S Customary Units of Weight?(4 votes)
- Because units change in every country in the world. For example, in Japan, people don't use inches!(3 votes)

- How many pounds are in 2 tons.(2 votes)
- One ton is 2,000 pounds, so 2 tons is 2*2,000 = 4,000 pounds.(6 votes)

- Is oz smaller than pounds(3 votes)
- Yes, one oz is less than 1 lb(2 votes)

- how many inches are in a mile?(2 votes)
- 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.(3 votes)

- How many pounds are in a ton?(3 votes)
- How do you tell the diference in ounces and pounds its confusing.(2 votes)
- 1 pound is equal to 16 ounces. Therefore 1 ounce is equal to 1/16th of a pound.(2 votes)

- how is this unit hard with Masses and Oz and lb and at we learned about this in FACS CLASS(1 vote)
- Once upon a time, in a FACS class far, far away, there was a kitchen scale that was notorious for its peculiar behavior. The scale was known to switch between units of measurement without warning, causing chaos and confusion among the students. One day, as the class began to measure ingredients for a recipe, the scale suddenly switched from ounces to pounds, causing the unsuspecting students to add ten times the amount of butter needed. The result was a horror story in the form of a greasy, inedible mess that haunted the class for weeks. From that day on, the students approached the scale with caution and always made sure to double-check the unit of measurement before proceeding.(4 votes)