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Creating equivalent fractions
Learn about equivalent fractions. It demonstrates how to find equivalent fractions using visuals, like dividing a whole into equal sections and shading them. The video also shows how to represent equivalent fractions on a number line. The examples used include 2/3, 4/6, and 6/9, which are all equivalent fractions. Created by Sal Khan.
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- If you want to find equivalent fractions with greater numbers, just divide the numbers from the first fraction by 2, such as 2/4, 2 * 2 is 4 and 4 * 2 is 8, resulting in 4/8 which is equal to 2/4.(10 votes)
- I meant to say multiply instead of divide, sorry.(8 votes)
- Why do fractions have to be equal?(8 votes)
- Because if they are unequal in doesn't make sense so let's say I have a pie and I want 5 people to have the pie and 4 of them are small and the 5th one is big the 5th person will have a big one and the 4 people that got the small pieces will not be happy.(2 votes)
- sal is so good at esplaining zeez tings(6 votes)
- Hi Sal you are very very clever, i like your videos and regards. Thank you, you teach as like a teacher.(7 votes)
- erase the shading in all but one smaller sqare(7 votes)
- do you have to draw lines inside of the shape(7 votes)
- Yes but shade the ones you need to shade so if your fraction is 5/6 I would shade 5 of the sixths(0 votes)
- how much ninths does it need to turn in to a sixth(4 votes)
- Is there any formula for quickly creating row of equivalent fractions? I realized that if we take 2/3, next fraction will be 4/6.. and there is formula like 2+2/3+3=4/6 and this formula continues to the infinity. In this fraction it's just adding +2 to the numerator and +3 to the denominator. Is there so me general formula or pattern for every fraction?(3 votes)
- Yes you are just multiplying (adding) the fractions times 2.
The way you are doing it is the way I've done it all my life.
I hope my answer helps you.(2 votes)
- why do fractions have to be equal(3 votes)
- We actually use this in real life, for example, mobile devices. 2 devices could have the same screen sizes but different pixel density or screen resolution.(3 votes)
So we've got this fraction written here, 2/3. What I want you to do is pause this video and try to think of any other fractions that are the same that are equivalent to this fraction right over here that essentially represent the same number. So to do that, let's visualize what 2/3 is. So let me draw a whole here. Let me draw a whole, and I'm going to divide it into three equal sections. So that is my whole. I'm drawing three equal sections I'm going to try to draw and make them as equal as i-- I can do a little better job than that. So that's 1, 2, 3. Three equal sections. And so 2/3 would represent two out of those three equal sections. So actually I can spray paint this. So that's 1/3 right over here, and then this is 2/3. So we have two of the three equal sections. So that is 2/3. And now let me copy and paste that so we can think about other ways to represent this fraction. So copy. And then let me paste it. I'll do it once, and then I'll do it another time. And I could do this multiple times, but I'll do it two other times right over here. So there's a couple of things we could do. The first option is we could take this and we could draw a horizontal line that divides each of these three sections into two sections. So let's do that. So now, how many equal sections do I have? I have 1, 2, 3, 4, 5, 6 equals sections. And how many of those equal sections are actually shaded in now. Well, we see it's 1, 2, 3, 4. 4/6. So notice, 4/6 is the exact same fraction of the whole as 2/3. These are equivalent fractions. We could say that 2/3 is equal to 4/6. Now, we could do something very similar. Instead of dividing each of these thirds into two, we could divide each of these thirds into three. So I could draw three horizontal lines here. So let's see 1, 2, 3. So now I have divided what was in three equal sections, I now have three times as many sections. I have 1, 2,, 3, 4, 5, 6, 7, 8, 9 equals sections. And then which of those are actually shaded in? We have 1, 2, 3, 4, 5, 6. 6. So 2/3, which is equal to 4/6, is also equal to 6/9. All three of these are equivalent fractions, 2/3, 4/6, and 6/9. And if you were to put them on the number line, the same thing would happen. So let's do that. Let's draw a number line here. Let's say that's 0. And I'm just going to focus on between 0 and 1. And obviously we can go beyond that. And let's divide it first into thirds. So this is 1/3 and 2/3. So we already know this would represent 1/3 and this is 2/3. We've gone two of the equal spaces of the three on the way to 1. We've divided the section between 0 and 1 into three equal spaces. Now, what for 4/6 be? Well, now we would just have to divide this into 6 equal spaces. So 1, 2, 4, 4, 5, 6. And 4/6, that would be 4 out of the 6 spaces on the way to 1. So 1, 2, 3, 4. So this number is also equal to 4/6. And you could do the same thing if you want to think about ninths. So what we could do, we could put 1, 2, 3, 4, 5, 6, 7, 8, 9. Now I've split this part of our number line between 0 and 1 into 9 equal spaces. Well, what would 6/9 be? Well, 1, 2, 3, 4, 5, 6. Once again, the exact same point on the number line. It's an equivalent fraction. 6/9 is equal to 2/3 is equal to 4/6.