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Lesson 5: Converting units of mass

# 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:

## 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

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:

## Practice set 2: Converting units of weight

Problem 2A
Convert.
$9$ pounds $=$
ounces

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
• bc 8 times 2 is 16 and then you just add the 3 zeros.
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Your heart's been aching, but you're too shy to say it (say it)
Inside, we both know what's been going on (going on)
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And if you ask me how I'm feeling
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Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
We've known each other for so long
Your heart's been aching, but you're too shy to say it (to say it)
Inside, we both know what's been going on (going on)
We know the game and we're gonna play it
I just wanna tell you how I'm feeling
Gotta make you understand
Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you

pls upvote
• LOL so funny
• 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.
• 55+55=?
• 55 + 55 = 110
Explain: we all know 5+5=10 and we add the one from the ten to the other 5+5 and that equals the same number as 5+5=10 so its 110
• how many ounces in a pound? I am braindead:/
• 16 ounces=1 pound
• pi = 3.1413926535897932384626...
• You actually got that wrong. It's 3.141592etc.
• 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!