Ratios, proportions, units, and rates

# Unit conversion

## Unit conversion: gallons to quarts, pints, and cups

What's the difference between gallons, quarts, pints, and cups? Soooo many people go their entire lives without knowing how to convert one unit of measure to another. Take note.
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## Unit conversion: gallons to quarts, pints, and cups

Discussion and questions for this video
Towards the end, he gets 7x16/2. Where did the 2 come from, and why did he only divide 16 by 2?
20 Votes
5 Comments
He skipped a step which would have been 7/2 (which was the problems) by 16/1 (which reflects the amount of cups there are in a gallon), and reduces both sides by two (dividing)... if you didn't catch this, you might want to go back to the multiply/dividing fractions module, and that'll help you catch up to what he did.
how do you convert let's say for an example gallons to pints or pints to quarts?
1 gallon= 4 quarts
1 quart= 2 pints
so, 4*2=8
1 gallon is the same as 8 pints
how come there is not just a video on only customary units? i get confused with metric=D
Metric uses entirely powers of 10, it is much much much easier then the units we use (known as Imperial Units). Metric is confusing right now because you haven't had nearly as much practice with it then you have with the Imperial system. You've been using the imperial system since what, first grade? Second grade? How long have you been using metric? If you work with metric enough you'll begin to wonder why we stick with such a crazy system in the US.
11 Votes
7 Comments
how many cups in one gallon ??
5 Votes
9 Comments
There are 16 cups in a gallon.
13 Votes
5 Comments
how do you convert oz to pounds
6 Votes
1 Comment
Their are 16 ounces in a pounds.

16 Ounces=1 Pound
1 Ounce= 1/16 Pounds
11 Votes
21 Comments
Is there something larger than a gallon?
9 Votes
2 Comments
Of course. You most likely will never need to know them, but there are some units larger than a gallon.
Off-site link to a video with a lot of them (not just volume):
http://www.youtube.com/watch?v=Q8qQolqkTU0
What is an easier way to remember how to convert between measurements?
draw a big G
then draw 4 Q in the g
then draw 2 P's in each q
and then then draw 2 c's in the p's
then it should look like a face
: )
How in the world am I supposed to remember/memorize all this?
A tip anybody?
And a tip for Anam is that just make up little tricks and if you want, you can draw gallon man. Search it up.
What type of gallon is he using... US or 'British?'
He is using the US version.
Read this it will explain the difference.
http://en.wikipedia.org/wiki/Gallon
This is not a question but I know an easier way with something called gallon man. It is a gallon with 4 quartz coming out and 2 pints coming out of each quart and 4 cups coming out of each pair of pints. This is showing how some things equal others. I wish I could show a picture.
6 Votes
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uuuhhhh i actually have never seen that way of doing that before. Thats a nice way to solve a problem!
I Think everything is correct
is that a question or?
i know this may be a dumb question but what does wps mean?
Not a dumb question -- its a good question! It's a matter of reading someone else's handwriting. Watch the video at 5:01, and you'll see that Sal is actually writing "cups," not "wps."
I like the way he made a picture for all the people who learn visually.
This is a Tips and Thanks.
A gallon is the greatest unit of measurement for liquid, right?
i'm sorry boys and girls but the biggest unit of measurement for volume is the cubic yottameter.
what if the pints are not the shown in the question
2 Votes
1 Comment
How can you find the unit conversion for cups to pints and quarts to gallons? And would people quit being rude to other people?
Well, a cup is 1/2 of a pint or 2 cups is equal to a pint. As for quarts to gallons, I remember that quarts are a quarter of a gallon or 4 quarts in 1 gallon! Hope this helped!
How many teaspoon are in 2 oz of liquid?
12 teaspoons... I just googled it:)
How can you convert gallons to pounds?
You can't. Gallons is a way to measure volume, and pounds is a way to measure weight. The reason why you can convert gallons to quarts, pints, or cups is because gallons, quarts, pints, and cups all measure volume. If you had a gallon of something (like water), you could use the volume of the water to find the weight of the water. But you can't convert gallons into pounds without something else in the equation, and it'll be different depending on what that "something else" is. You will learn more about this in the chemistry and physics playlists.
How do u convert cups into fluid onces?
Every cup is 8 fluid ounces.
is there an easier way to do that
Yeah.
1. Find out how many cups are in 1 gallon.
2. Multiply the number of cups (16) by 3 (in 3 1/2).
3. Since 8 is 1/2 of 16, add 8.
Hope this helped! Sorry if it didn't make sense.
sal should covert the unit more clearly
if u would've listened more carefully uwould not be asking this question
2 Votes
3 Comments
Why didn't you turn 7/2 into a decimal, 3.5?
Converting to decimal would have added several more steps. It's much easier to leave it as a fraction. Besides, if it had been 7/3 instead of 7/2, what would you do then? Converting to decimal would require an inconvenient repeating digit. Better to get used to doing things the right way and leaving intermediate fractions as-is.
The opening screen of the video provides this comment, "What's the difference between gallons, quarts, pints, and cups? Soooo many people go their entire lives without knowing how to convert one unit of measure to another. Take note. "

Khan Academy admirably promotes the idea of holistic learning, meaning that math and science problems regularly teach other lessons outside of math and science. Standard English grammar should be as precise as math and science. Therefore, a Khan Academy editor should revise "What's the difference between gallons, quarts, pints, and cups?" to "What's the difference AMONG gallons, quarts, pints, and cups?" Between signals comparison of TWO items, while AMONG denotes comparison of more than (>2) items.
Very observant! However, you should probably put this tip under Tips and Thanks for Sal and the Khan Team to review, otherwise you could get a flag or negative votes.
Interestingly enough, though, Sal prefers to not edit his videos to create the effect that a teacher is giving a lesson on the screen. Although it creates the occasional grammar slip, in the end, it's probably working, because I know at least I have learned a lot.
However, as a fellow believer in good grammar, I genuinely think you should put this under Tips and Thanks, because you raise a fair point.

Hope it helped!
how many cups are in 3/4 gallon
A gallon is equal to 16 cups. 3/4 is equal to 12/16, so there are 12 cups in 3/4 of a gallon. Hope this helps!
Is there something smaller than a cup?
yes, there is another measurement called an ounce. there are 8 ounces in one cup.
Is there something smaller than an ounce?
In the standard system, there is nothing smaller than an ounce. However, in the metric system, milliliters are smaller than ounces.
Is it more efficient to use this system or metrics?
Is there anyway to make remembering this easier?
How do you convert gallons to liters?
There are 3.78541 liters in one gallon.
The video is great.
the video is amazing
Why do like to change it into a improper fraction? I think proper fractions are easy to use better then improper fraction. It would make more sense to just use proper fractions.Thanks though!
because with improper fractions, it is just one set of numbers. Looking at it is harder than doing it....
how many cups = 16 fluid ounces
There are 8 cups to a fluid ounce. Another way of writing this could be 8(fluid ounces) = 1(cup). Since you want to know the conversion of 16 times this amount, multiply both sides by 16 and you get 2(cups) = 16(fluid ounces).

EDIT: This is wrong, the answer is 2 cups, I just looked at this and it didn't make much sense to me. There are 8 fluid ounces to a cup so you multiply both sides by 2 and you get 16(fluid ounces) = 2 cups
how many gallons and qt in 38 pints
well each quart is 2 pints so there are 38/2 qts in pints which is 19 qts.
and then there are 8 pints in a gallon so 38/4=9.5 gallons in 38 pints.
please vote up if this helped!
38 Pints = how many gallons and qts
4 gallons, and 3 quarts.
why is it hard to understand
2 pints and one quart how many cups are in 3 1/21 gallons?
1 Vote
1 Comment
So, the answer is 56, 56 divided by 56 is 1. 1 times the number of years that my brother is = 3. 3 divided by the amount of fingers i have = 1.5. 1.5 x 2 the number of how many tabs i have open = 3
The Illuminati has 3 sides. #Illuminaticonfirmed!
How were you supposed to know how many cups there are in a pint, how many pints there are in a quart, and how many quarts there are in a gallon.
what grade r u in
Why doesn't talk about metric stuff like liters and meters?
He has that in the U.S. Customary and Metric Units video.
Like I said to someone else, if you are still wanting to see a video on that here is the link;
http://www.khanacademy.org/math/arithmetic/rates-and-ratios/unit_conversion/v/u-s--customary-and-metric-units
Ask a question...I need help with the multi and divi part
Can you divide gallons into pints?
Yes:
1 gallon = 4 quarts = 8 pints
I have a question when converting do you use larger 2 smaller?
Thanks for that video now i know what to do for the last test of the year. Once again thanks and i have confident 4 my last test of the year.
could you multiply the 2 cups/pints by 2 pints/quart then by 4 quarts/gallon?
You could, if you like!
I don\t understand why Sal does this:
8 pint / 1 galon * 2 cups / 1 pint

Why not multiply the pints with the pints? I mean I learned the process: if fraction 1 has pint at numerator,fraction 2 should have it at denominator,but I just don't understand why.
Some people call it "dimensional analysis". I have no idea why but it would look like this:

8 pints 2 cups
-------- * ------
1 gallon 1 pint

If you multiplied the pints, you would get

8 pints²
---------------
2 cupic gallons

Now does that make any sense? No!

When you multiply Sal's together, you will get

8 pint(s) * 2 cups
-----------------
1 pint * 1 gallon

Notice that I switched around the gallon and the pint at the bottom to make the next step more understandable. This works perfectly due to the commutative property of multiplication.
Now remember how you can simplify

2 * 6
-----
2 * 2

By getting rid of the 2 altogether? This works because they are being multiplied, which is the opposite of division. 12 / 4 is 3, just like 6 / 2
You can actually do that to get rid of the word "pint". Literally! You can cancel the units, by getting rid of the unit from the numerator and denominator from the number they are attached to. That might not be the best explanation, but it results in this:

8 * 2 cups
------------
1 * 1 gallon

Now think about it, if you have 8 groups of 2 cups each (8 * 2 cups), you really have 16 cups! And if you have a group of a gallon each, you really have a gallon! So:

16 cups
--------
1 gallon

Which is actually the exact number of cups in a gallon! Cool huh?
The reason fraction 1 has it in the numerator and fraction 2 has it in the denominator, is that you can cancel out the word "pint".
Why don't they include ounces?
i hate khan academy
Is there a tutorial for metric staircase conversion?
1 Vote
1 Comment
There a tutorial. It is in the fourth grade U.S. --->Measurement and data---> Measuring with metric and U.S. customary units: intro.
i need help remembering how many quarts a gallon, how many pints per quart and how many cups per pint. HELP :(
what is the difference between gallons and quarts
There are 4 quarts in a gallon. Quart(er)
What type of.. I guess coloring thing are you using in your video?
How many oz are there in a cup, pint, quart, and gallon
There are 8 oz in a cup. 2 cups in a pint. 4 pints in a Quart and 4 quarts in a gallon.
Why is gallons in the numerator? Can you set this up as a ratio with an equal sign? Putting the gallon in the denominator and the unknown cup in the numerator? Or is that what is happening and your just not showing it?
Yes, when you set up proportions, you can choose to write the ratios with either unit in the numerator or denominator AS LONG AS you are consistent in both ratios. Like, if you choose to put gallons on top and cups on the bottom, you must put gallons on top and cups on the bottom for BOTH ratios in the proportion.
dosen't wps mean words per second?
Are there any more fluid unit reviews in KA?
Why do you cancel out when you have 2 quarts to find pints?
how do you convert a picture through space
32 qt has how many cup
32 quarts is 128 cups, since 1 quart=4 cups
i don get it and im only in second grade
do the topics by grade , you might have skipped over multiplication and division which are needed for conversion questions. From memory unit conversion is around 4th grade so it assumes you can multiply and have seen fractions
Is there an easier way to remember how many cups are in a gallon, pints in a quart etc.
Well quart is easy as you can just think of it as quarter (one fourth) of a gallon. The other two just need to be memorized and used a bunch.
the next two are built in twos, a pint is half as much as a quart, a cup is half as much as a pint.
you rock dude!
I completely agree; it's just that this belongs in the Tips/Thanks.
Couldn't you multiply 3x16, then add 8 (1/2) to the product?
what is the smallest unit in both measurements?
How do you covert cubic cm to gallons?
Dude do your multiplication in your head and can you get a little more tone?
Is there an easy way to remember how many quarts are in a gallon, how many pints are in a quart and how many cups are in a pint? In Canada, we are taught the metric system, which is based on the number ten
why would he be drawing pictures isnt he supposed to be explaning more i dont get it.
he drawing pictures because learning is achieved through paintings, other people learn through listening.
you could have multiplied 16 by 3 and then added 8 four the half gallon. When I did it it still got me the same answer and it was easier for me. Is there a reason we do it the other way?
couldn't you just multiply 16 times three then add eight
At 5:00, you calculated there to be 56 cups in a gallon. Before I tried it on my own, but I got 16. This is what I did:
1 gallon * 4 = 4 quarts
4 quarts * 2 = 8 pints
8 pints * 2 = 16 cups
I know I got the numbers right, but I don't know if I did it right. I also don't understand the way sal khan did it.
how do you compare 400 pint to 100 gallons?
You would need to covert to a common unit of measure...8 pints are in 1 gallon so you could compare it either way: 50 gal to 100 gal OR 400 pint to 800 pint
I have a test coming up and I was curious if any one had any way for me to remember the different conversions.
Thanks,
Taylor
don't you think this guy made it seem way too complicated?
No way it makes sense to me
ill give you all a problem. Afton made a chicken dish for dinner. She added a 10 oz. package of vegetables and a 14 oz. package of rice to 40 oz. of chicken. What was the total weight of the chicken in pounds?
The answer is 4 pounds.
How many pints in a gallon?
I believe there is 8 pints in a gallon, friendo. :)
2qt 8 fl oz= what
7 cups is how many pints?
A cup is equivalent to four quarts. A quart is equivalent to two pints.

So 7 cups=28 quarts.
28 quarts= 56 pints.

Therefore 7 cups=56 pints.
this is kind confusing :(
1 Vote
1 Comment
i didn't understand what sal was saying. can sal make another video that is more clear