Arithmetic (all content)
Dividing fractions is a breeze when you follow these simple steps! First, multiply the first fraction by the reciprocal of the second fraction. Then, multiply the numerators and denominators separately. Voila! You've successfully divided two fractions and found your answer. Keep practicing to master this essential math skill. Created by Sal Khan.
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- can khan academy become drawing academy instesd so we can just take a brake from school(21 votes)
- is there another method to do this(8 votes)
- (Prepare for a long answer) Srivish, To answer your question, there IS another way to solve it. Cross multiplication. Here are some steps to help solve it
1: First take your Equation, and if you've already written an answer. Erase it, then write a new set of brackets to have your fractions in.
2: Secondly, take your equation. Let's ignore that division sign for now. So you have your two pairs of fractions, Correct?
3: TO do this, you will have to multiply a bit. First, take the numerator of your first fraction, and multiply it with the denominator of the second Fraction. This will turn into your new Numerator. Now cross off the fractions you just used.
4: Following this, Take your remaining fractions and multiply. This will turn into your new denominator. And complete your answer.
However, if your Equation with variables, such as X, the whole question will change. In order to adapt to this, you will have to change the way you solve it. Here is a link detailing how to.
Hope this helps!(21 votes)
- at 0.29 i didn't understand why we flipped it(7 votes)
- Because dividing is the same thing as multiplying by the reciprocal of a number. A reciprocal is basically just a number flipped upside down. Example: 4 ÷ 2 is the same thing as 4 * 1/2.(7 votes)
- This is really tricky. As a 5th grader I should be knowing this stuff, (technically a 6th grader because I graduated last Friday.) And It's really hard for me to focus at this stuff, but to anyone out there, promise me you wont give up <3(7 votes)
- How the heck does a reciprocal even work?! I'm mind blown. Can somebody tell me why?(7 votes)
- A reciprocal is when you flip the numerator and the denominator to get it. So 2/4 would become 4/2, 5/6 would become 6/5, and so forth.(1 vote)
- Do you still have to do the extra math to the side to get the actual answer.(1 vote)
- When dividing two fractions how many methods are there and what are they?(3 votes)
- its keep flip change like keep the first number flip the second number change to multiplication and multiply(3 votes)
- oh, my gosh, i was hoping Sal would show us on the number line as is the previous video. i have no problem with solving the problem, but i have no intuitive understanding! in the last video he worked on 8/3 divided by 1/3. it meant we were breaking up 8/3 into segments of 1/3 of a unit each. so we ended up with 8 segments of 1/3 unit, total. i have no idea how to follow that logic for 2/5 divided by 7/3... help, someone? thank you!(2 votes)
- Same idea except this time the segment is larger than the initial amount. If we have segments of 7/3 (2 1/3) how many of them make 2/5. In this case you need less than one of them. 6/35 of one in fact. This is because 6/35 of 7/3 equals 2/5.(3 votes)
- I like and respect Khan Academy, but could they make the videos fast like this one? It gets boring when to rant.(3 votes)
- I don't get it how do you divid fractions(2 votes)
- you can just take the fraction on the right and switch the two numbers around (so the numerator becomes the denominator and the denominator becomes the numerator) then just multiply the two fractions and you have your answer!(2 votes)
So let's calculate what 2/5 divided by 7/3 is, and I encourage you to pause this video and try to calculate this on your own. Well we just have to remind ourselves that this is going to be the exact same thing as 2 over 5 times the reciprocal of 7/3, which is 3 over 7. And then multiplying two fractions is pretty straightforward. This is just going to be equal to the product of the numerators. So 2 times 3 over the product of the denominators, over 5 times 7-- I'm trying to keep the colors consistent-- which of course is going to be equal to 2 times 3 is equal to 6. And 5 times 7-- I'll do this in a new color, let's see, I haven't used this shade of blue yet-- 5 times 7 of course is equal to 35. So this is equal to 6/35.