Main content
MAP Recommended Practice
Unit 50: Lesson 9
Converting units of massConverting pounds to ounces
CCSS.Math:
There are 16 ounces in 1 pound. Learn to convert pounds to ounces. Created by Sal Khan and Monterey Institute for Technology and Education.
Want to join the conversation?
There two fish caught at a fishing competition, one weighed 31 lbs and 17lbs 2 oz. What is difference in weight?(10 votes)
The difference in weight is 14 lbs and 2oz.(3 votes)
Are there smaller units of measure other than nano grams? If so, what are they?(7 votes)- How to compare 7 pounds to 120 ounces(3 votes)
- Is it fair to say we can place the unit we're trying to solve for (in this case ounces) "across" from the starting term, therefore always placing the opposite term in the opposite position? For some reason the way Sal instructs to place the unit in the opposite position and 'cancel out' confuses me.(3 votes)
- I think what you're saying is correct if you mean the unit that cancels goes in the numerator of the first ratio and the denominator of the second ratio. I also get confused when Sal does that, but it's something you'll need in the higher maths and sciences. If your way gets you the right answer with the right units keep going, you should be fine. Good Luck!(4 votes)
- How can I convert onuce to pounds not pounds to onuce(2 votes)
There are 16 ounces in a pound. So you would divide the amount of ounces by 16. For example: 80 ounces is equal to 5 pounds.(4 votes)
Is Sal using fractions with this or is this just another way of thinking about this? If anybody could help me, I would be most thankful for your help.
=D(3 votes)- Can you explain DIMENSIONS in detail ?(3 votes)
How do you convert grams to ounces?(3 votes)- how many ounces are in 7 pounds(3 votes)
I don't get it! Can someone please help me?(3 votes)
Video transcript
How many ounces are
in 6 pounds? So we have 6 pounds
and we need to convert them to ounces. And if you don't know it
already, you'll know it now, that there are 16 ounces
per pound. So what we want to do is we
want to have pounds in the denominator. It's in the numerator
right now. So we want to divide by pounds
and multiply by ounces. Maybe I'll write it out. And I just told you
that there are 16 ounces for every 1 pound. So if we multiplied these two
expressions, this pounds will cancel with that pounds, and
we'll just be left with the unit of ounces, which is what we
want, and we just multiply 6 times 16. So it works out unit-wise, and
it makes sense as well. If we have 16 ounces per pound,
and we have 6 pounds, we just have to multiply
6 times 16. That'll be the total number of
ounces we have. So this is going to be equal to--
what's 6 times 16? So if you take 16 times
6, 6 times 6 is 36. Carry the 3. 6 times 1 is 6, plus 3 is 9. So 6 times 16 is 96. You have this divided by 1 here,
but that's not going to change anything. And then all we're
left with in the dimensions are the ounces. So 6 pounds are 96 ounces.