If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Numbers & Operations - The Real & Complex Number Systems 211-217

### Course: Numbers & Operations - The Real & Complex Number Systems 211-217>Unit 7

Lesson 1: Fractions as division

# Understanding fractions as division

In this video, we learn about the relationship between multiplication and division. Let's watch how they can undo each other. We can understand this concept with whole numbers and fractions. Created by Sal Khan.

## Want to join the conversation?

• so we can do division or multiplecarion
• * correction* M-u-l-t-i-p-u-l-c-a-t-i-o-n
• If you still don't understand how to divide fractions. I will show you. There are 3 steps.
So say you were doing 1/3 divided by 6 or 6 divided by a third.
We will do 1/3 divided by 6 first.
Step 1: Keep the number 1/3
Step 2: Switch the division symbol to multiplication
Step 3: Find the reciprocal of 6. And its 1/6 so 1/3 times 1/6 is 1/18. Sometimes you need to simplify.
Now 6 divided by 1/3
Keep 6.
Turn to muliplication
Switch 1/3 to 3/1
its easier as 6/1x3/1 and that's 18/1 which can be reduced to 18
Hope this helped
• Bruh what I want to know is how to divide a fraction with a fraction that has a different denominator.
• just anotha day of khan making things complicated FOR NO REASON💯🔥🗣🙏
• if you learn to understand, it wont be hard.
• KFC method
• ITS keep change flip NOT Kentucky fried chicken
• Does anyone else wonder why this is on the get ready for seventh grade course? Coming from a 6th grader going into 7th in september! Comment below please!!
• I assume that your teacher just figured you could use some review work. Even if you think it is easy, if it is due by the start of school, you should probably do it.
• Any tips? I would love that please! I still cant do it myself.
• Swap the numerator and the denominator, (the top and bottom numbers in a fraction) on the second fraction. WHATEVER YOU DO, DO NOT DO IT FOR THE FIRST FRACTION. For example, 1/2 x 3/9, so it would be re-written as 1/2 x 9/3, and then you just multiply it, which would be 9/6, and then, you divide the numerator by the denominator, so just think, "how many times can 6 go into 9? And how much is left over?" So, if you were to do that, the answer would be 1 3/9, which, by the way, was you second fraction that you swapped. And, if you know how to, then you would simplify, and your final answer would be 1 1/3. (Oh, and by the way, the word for swapping the numerator and the denominator is called recipricals. So if you ever see that word in a test or a math question, then you know what it is.
• what's the point of this video
• when it says 5 millimeter can fit in a bottle of perfume how do you answer it when it says how many 2 millimeters can fit in there it is too R one how do you write that so that i dont get the answer wrong again and again.
• You’re right that one way we could write the answer to that problem is 2 R 1, but this lesson is focusing on fractions in division. How can we represent the answer with a fraction instead?

We could use an improper fraction, 5/2. We could also use a mixed number, 2 1/2.

Does that help?