Ratios, proportions, units, and rates
Unit conversion
None
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.
Discussion and questions for this video
 How many cups are in 3 and 1/2 gallons?
 So before even addressing this question, let's just think
 about how large a cup is.
 Actually, I'll give you a little bit of overview of how
 many cups there are in a pint, how many pints in a quart, and
 how many quarts in a gallon.
 Let me just draw a cube here, and let's imagine
 that this is a gallon.
 The most common time we see a gallon is when you see a
 gallon of milk.
 So let's say that that whole thing is a gallon.
 You can imagine if it had a handle, it would be kind of a
 big gallon of milk.
 Now, there are 4 quarts per gallon.
 Let me write this over here.
 There are 4 quarts per gallon.
 So if I were to draw the quarts here, I could divide
 this gallon into 4 quarts, and then each of these sections
 would be a quart.
 So you would have 4 quarts.
 So this right here that I've just drawn in blue would be
 exactly 1 quart.
 And obviously, there's 4 of them in this entire gallon.
 Now, you can divide the quarts into pints.
 You have 2 pints per quart.
 So this quart that I drew here, I can divide it into 2,
 like that, and this little section that I'm highlighting
 in magenta is a pint.
 That is a pint right over there.
 And then finally, there are 2 cups per pint.
 So this pint right here, I can divide it into 2, and each of
 these will be a cup.
 So this section right here will be a cup.
 Now, we can go straight and figure out exactly how many
 cups there are per gallon.
 Actually, that might be an interesting way
 to think about it.
 If you have 4 quarts let's multiply it right here.
 So you have 4 quarts per gallon
 times 2 pints per quart.
 What does this give you?
 This gives you 4 times 2 is equal to 8.
 And then the quarts cancel out, and you
 have 8 pints per gallon.
 And that makes complete sense because we had 4 quarts in
 this gallon, and then each of those quarts
 have 2 pints in them.
 So 4 times 2.
 So 8 pints per gallon.
 And then we can multiply that times 2 cups per pint.
 So I could just copy and paste this right here.
 Actually, I should've cut and paste.
 Let me select it again.
 I want to do that so I get that real estate back.
 So edit, cut, edit, paste.
 There you go.
 So now you multiply this times 2 cups per pint.
 And the reason why this will work is because you have pints
 in the numerator.
 It cancels out with the pints in the denominator.
 And you will be left with I'll go back to the yellow 8
 times 2 is 16.
 In the numerator, we have cups per gallon.
 Now, we just figured how many cups there are per gallon.
 That makes sense.
 This section right here is exactly 1/16 of this entire
 cube, this entire gallon.
 But we haven't even answered our question.
 We want to figure out how many cups there are
 in 3 and 1/2 gallons.
 So let's write it over here.
 So we're concerned with 3 and 1/2 gallons.
 I don't like working with mixed numbers.
 I like to turn them into improper fractions.
 3 and 1/2 is the same thing as 2 times 3 is 6, plus 1 is 7.
 This is the same thing as 7/2.
 If you divided 7 by 2, you would get 3 with a remainder
 of 1, or this would be 3 and 1/2, so this is
 the exact same thing.
 So we want to know how many cups are in 7/2 gallons.
 So what we want to do is end up with cups, and we want the
 gallons to cancel out.
 So we have gallons in the numerator right here.
 It's definitely not in the denominator.
 And so we want to divide by gallons.
 And then we're going to have a numerator.
 We have cups in the numerator.
 And how many cups are there per gallon?
 Well, we just figured that out.
 There are 16 cups per gallon.
 When you multiply these two quantities, the gallons will
 cancel out, and you'll just be left with cups, and that's
 what we wanted.
 So it's going to be 7/2 times 16.
 So this is going to be 7 times 16/2 cups.
 You could divide 16 by 2 to get 8.
 2 divided by 2 is 1.
 So it just becomes 7 times 8 divided by 1, or just 7 times
 8, which is 56.
 So this is equal to 56 cups.
 And this should make sense.
 This should be a much larger number because cups are a much
 smaller unit.
 So if you have 3 and 1/2 gallons, you will have many,
 many, many more cups in that 3 and 1/2 gallons,
 so this makes sense.
Be specific, and indicate a time in the video:
At 5:31, how is the moon large enough to block the sun? Isn't the sun way larger?

Have something that's not a question about this content? 
This discussion area is not meant for answering homework questions.
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
1 quart= 2 pints
so, 4*2=8
1 gallon is the same as 8 pints
1 gallon = 4 quarts
1 gallon = 8 pints
1 gallon = 16 cups
1 gallon = 8 pints
1 gallon = 16 cups
how many quarts are in a half gallon
how do you convert a picture through space
1 gallon is 8 pints
1 pint is 1/2 quarts
1 pint is 1/2 quarts
1 gallon = 4 quarts
1 gallon = 8 pints
1 gallon = 16 cups
1 gallon = 8 pints
1 gallon = 16 cups
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.
Almost every country besides the USA uses metric. All scientists, even the ones in the USA use metric though :P
Many of us uses English systems that's the pint, gallon, cup, ounce and we should learn about it because we can use it on our daily lives.
USA is different. i feel the same way. customary system is so confusing and metric system is so easy
But I want to learn a bit about customary units because I'm from Vietnam.
good good! i am enjoying.
i just need help converting all of the quarts, pints, gallons etc. can you help me? please thank you
how many cups in one gallon ??
There are 16 cups in a gallon.
1cup=8ounces
1pint=2cups or 16ounces
1quart=2pints,4cups, or 32 ounces
1gallon=4quarts, 8pints,16 cups,or 128 ounces
1pint=2cups or 16ounces
1quart=2pints,4cups, or 32 ounces
1gallon=4quarts, 8pints,16 cups,or 128 ounces
so there are 2 cups in a pint, and two pints in a quart. That makes 4 cups in a quart because 2*2=4. There are also 4 quarts in a gallon (if you've seen a 1/2 gallon of milk it's two quarts) so that make 4*4= 16 cups in a gallon!
There are exactly 16 cups in a gallon. 1 gal=4 quarts,1 quart=2 pints=2 cups
There are 16 cups per a gallon (If you don't know the island of G I will tell you: Welcome to the island of G, there are 4 queens, 8 princes, (or princesses however you like) and the Prince or Princess each had 2 children)
Yes, there is 16 cups in a gallon because there is 4 quarts in 1 gallon. Then there is 4 pints in a quart.2 cups=1 pint and 4 cups(2 pints) is equal to 4 cupsx4 pints=16 cups. So, there are 16 cups in a gallon.
Further I readily am aware of these numbers, because I buy (64 oz) half gallon almond milk and cook in increments of 1 cup.
There are 16 cups in a gallon. 1 cup = 8 oz & 1 gal = 128 oz 128/8=16
This tutorial could have been answered in a much shorter time if the method of conversion of ounces to gallons had been employed.
My approach was to do the calculations 1 cup = 8 oz & 1 gal = 128 oz 128/8=16 and then say 3.5 * 16. Of course the answer is 56.
This tutorial could have been answered in a much shorter time if the method of conversion of ounces to gallons had been employed.
My approach was to do the calculations 1 cup = 8 oz & 1 gal = 128 oz 128/8=16 and then say 3.5 * 16. Of course the answer is 56.
how do you convert oz to pounds
Their are 16 ounces in a pounds.
16 Ounces=1 Pound
1 Ounce= 1/16 Pounds
16 Ounces=1 Pound
1 Ounce= 1/16 Pounds
There are 16 ounces in one pound
16 ounce=1 pound
Then 1/16 of a pound is 1 ounce.
1/16 pounds=1 pound.
Hope that this helped.
16 ounce=1 pound
Then 1/16 of a pound is 1 ounce.
1/16 pounds=1 pound.
Hope that this helped.
everyone google has customary+metric calc
tha said sad u sad
Is there something larger than a gallon?
acreinch = 27,154.3 gallons (US, liquid)
acrefoot = 325,851.4 gal.
barrel (US, liquid) = 31.5 gal.
drum (US, petroleum) = 55 gal.
hogshead (I'm not kidding) = 63 gal.
pipe = 126 gal.
acrefoot = 325,851.4 gal.
barrel (US, liquid) = 31.5 gal.
drum (US, petroleum) = 55 gal.
hogshead (I'm not kidding) = 63 gal.
pipe = 126 gal.
Of course. You most likely will never need to know them, but there are some units larger than a gallon.
Offsite link to a video with a lot of them (not just volume):
http://www.youtube.com/watch?v=Q8qQolqkTU0
Offsite 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?
You should be able to remember by the kingdom of G. Draw a big G (for gallons) inside draw four Q( for quarts) inside of the Q draw two P(for pints) and inside of that draw 2 C (for cups). The story goes something like this, there once was a kingdom G that had 4 queens. Each queen had two princesses. Each princess had two cats . The end.
if it helps mutiplication and division are always helpful when it comes to converting units
i agree with Draval1. my sisters teacher taught their class the buterfly trick for remembering. search it up on Google!!!
the word quart sounds like quarter which makes me think of four. so i know there are four quarts in a gallon. look at the label of your typical bottle of water which is roughly 16 oz, the equivalent of one pint or 2 cups, thus one cup is 8oz.
draw a gallon man
Study or write it down somewhere where you can see it a lot. Memorization is key when it comes to dimensional analysis.
How in the world am I supposed to remember/memorize all this?
A tip anybody?
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.
There are 4 quarters in a dollar,
just as there are 4 quarts in a gallon.
Gallon6 letters
Quart5 letters, 4 in a gallon
Pint4 letters, 2 in a quart
Cup3 letters, 2 in a pint
I hope this helps you!
just as there are 4 quarts in a gallon.
Gallon6 letters
Quart5 letters, 4 in a gallon
Pint4 letters, 2 in a quart
Cup3 letters, 2 in a pint
I hope this helps you!
well you could try to memorize it while on the toilet
You can memorize gallon man or the big G they are very helpful. (google it if you don't know what the big G or gallon man)
Kingdom of G (scroll up and you'll find it written by me, pragya jha)
For those that have not grown up with these measurements it is a bit difficult as opposed to the SI system with base 10. Usually, you can use a conversion table.
If you are not familiar with our system, then work with it, your hands and your eyes. Draw it out like the video does. Working with the individual parts will help you understand:) . These concept (1 gallon equalls 4 quarts, etc ) are all memorized when we were young, same as when you were young you memorized another system. Don't let it get you stuck.
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
Read this it will explain the difference.
http://en.wikipedia.org/wiki/Gallon
im pretty sure hes using the US version
Definitly the US version
how do i memorize all this
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.
uuuhhhh i actually have never seen that way of doing that before. Thats a nice way to solve a problem!
I've seen it. I used it quite often in past years. It's very helpful.
What is a percentage ?
A percentage is a value / 100. Per cent means per 100.
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.
Show all 2 answers to †Tywysog y Goron Carl O Gymru† ✠(I Am Catholic)✠ (Irish Dancer)'s question
•
Answer this question
Kiloliters are the greatest unit of liquid measurement because 1,000 liters is way more than just 1 gallon.
I Think everything is correct
is that a question or?
What is a cent, then?
A cent in mathematical terms means 100. In other terms a cent can also mean 1/100 of a dollar = 1 cent or 1 penny
What's 9+10 every one says its 21 but the calculator says its 19 IM SO CONFUSED
9+10 is in fact 19, because 10 + 5 + 4 = 15 + 4 = 19. Everybody says it's 21 because it's a stupid internet thing, don't listen to them.
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."
how many quarts in a gallon
There are 4 quarts in a gallon.
And..
2 pints in a quart,
2 cups in a pint,
thus, 16 cups/8 pints in a gallon.
And..
2 pints in a quart,
2 cups in a pint,
thus, 16 cups/8 pints in a gallon.
There are 4 quarts in a gallon
I like the way he made a picture for all the people who learn visually.
can you divide?
Yes, of course.
what if the pints are not the shown in the question
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!
Is this video using the U.S customary system?
Yes its customary because metric system uses liters and stuff
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.
You can't. Gallons are for liquid measurements of capacity and pounds are weight measurements of capacity.
Well the reason I posted this question because I couldn't find anything useful to help with this question: 900g/day = ___ lb/day
How do u convert cups into fluid onces?
How many cups are in a liter?
there are 4.226 cups in a liter.
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.
Any recommended website with good metric conversions?
Google has a built in unit converter. Simply type a query such as "5 quarts to liters", and Google will respond with the conversion. Neat!
What does a semi colon mean in algebra
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.
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.
I'm just doing this section so that I can complete ratios, proportions, units, and rates. I'll never use Imperial because it's not used here.
If I went to the USA would I really have to know this old stuff for a real work place? When I work over in the UK older people in general conversation sometimes refer to the old Imperial system they used back in the 1970's, (which I think is different to the USA Imperial), but it would never be used in a formal setting like at work on a building site or in engineering or shops or anywhere come to think of it except I think their road distances might still be in UK miles in most places, though I have seen normal Km in a few places there too.
Metric is so much easier and universal, and I've never heard anyone except a North American use Fahrenheit for temp. I don't understand that temp scale at all. I've only ever used Kelvin and Celsius. I find this cultural difference social stuff interesting. Is it just social habit to use these old systems or is it because it's too economically expensive for the USA to play catch up and change everything?
If I went to the USA would I really have to know this old stuff for a real work place? When I work over in the UK older people in general conversation sometimes refer to the old Imperial system they used back in the 1970's, (which I think is different to the USA Imperial), but it would never be used in a formal setting like at work on a building site or in engineering or shops or anywhere come to think of it except I think their road distances might still be in UK miles in most places, though I have seen normal Km in a few places there too.
Metric is so much easier and universal, and I've never heard anyone except a North American use Fahrenheit for temp. I don't understand that temp scale at all. I've only ever used Kelvin and Celsius. I find this cultural difference social stuff interesting. Is it just social habit to use these old systems or is it because it's too economically expensive for the USA to play catch up and change everything?
There is a really great book on the subject called: The Measure Of All Things. It chronicles the making of the meter and the metric system. It's like an adventure story about two men setting out in opposite directions through war torn France to measure a section of the earth's meridian. It takes them years to finish their task while being imprisoned, wounded, sick, stuck in foreign country. It's a fun read and would answer your questions.
i never remember how many yards are in one mile! help!!
There are 1760.
sal should covert the unit more clearly
if u would've listened more carefully uwould not be asking this question
hi sal khan!! i had a question about double bar graphs and was wondering if you have time or if not to late.. if you could make an exercise and video!
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 asis.
You are right
sometimes its easier to work with fractions for some people. I prefer decimals myself but to each their own.
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.
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!
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?
110 mi/h = mi/day
As a person who lives in Australia. I have never seen a gallon of milk.
One US gallon is about 3.75 liters.
How do you convert gallons to liters?
There are 3.78541 liters in one gallon.
https://www.youtube.com/watch?v=E4UC_StFhAk
Might be helpful for some of you.
Might be helpful for some of you.
The video is great.
the video is amazing
the video is ok
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
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!
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?
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/ratesandratios/unit_conversion/v/uscustomaryandmetricunits
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/ratesandratios/unit_conversion/v/uscustomaryandmetricunits
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
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.
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".
```
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".
I did catch that.
Why don't they include ounces?
i hate khan academy
because It's units of capacity standerd
What is the name of the method where you can cancel out the units diagonally.
Simplifying of maybe cross multiplying
Towards a little more than the middle of the video, he has this equation lined up. Is there a name for that method where you can just cancel out diagonally the units?
Is there a tutorial for metric staircase conversion?
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 program do u use to make this videos? they are really good!
What type of.. I guess coloring thing are you using in your video?
At 5:56 how did Sal get 7*8 over 2?
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.
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
what about tons?
There r 2000 pounds in a ton
32 qt has how many cup
32 quarts is 128 cups, since 1 quart=4 cups
how do you find the unknown in a proportion
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
How many ml are in 0.25 liters?