Main content

### Course: 4th grade > Unit 7

Lesson 3: Comparing fractions with unlike denominators visually# Comparing fractions: fraction models

Sal compares fractions visually with pies.

## Want to join the conversation?

- Are there any other way to solve this equations?(20 votes)
- What would you do if you had improper fractions? Use a different technique?(9 votes)
- no,the tequenice is the same(3 votes)

- Are there diffrent ways to solve this?(6 votes)
- I know you just watch another vid about it(7 votes)

- shoudent 7/10 be bigger then 8/9?(0 votes)
- In the fraction 7/10, the pieces are smaller than they are in 8/9 because the whole is broken up into more pieces. Because you have more of the bigger pieces (8 pieces compared to 7), that is the bigger fraction.(20 votes)

- What are fractions?(1 vote)
- Fractions are the parts that form a whole.(1 vote)

- cant we just use a common denominator(2 votes)
- are there any other ways to solve this equations?(2 votes)
- how does what he said make sense? I don't understand at all.(2 votes)
- So the fraction with the smallest denominator is going to be the biggest fraction?(1 vote)
- only if it is filled(2 votes)

- is 7/10 bigger than 8/9? Yes or No?(1 vote)
- 8/9 ig bigger and did you post this befor or after the vido.(2 votes)

## Video transcript

- What I want to do in this video is compare the fraction
7/10 to the fraction 8/9. And, like always, I encourage
you to pause the video and see if you can figure
out where these things-- one of these is larger than the other, or whether they are equal. So, for me in this video, I
want to think about it visually. And I'm going to do that
using wholes of the same size that are circles. So let me draw them or
let me get them, here. So there you go, so these
are wholes of the same size. I'm gonna compare 7/10 of
this whole of the circle to 8/9 or this whole. Which is a circle of the exact same size. If you're comparing 7/10 of a small circle to 8/9 of a bigger circle
or 7/10 of a big circle to 8/9 of a smaller circle
or a different shape, then you really can't make the comparison. But we're gonna compare
7/10 of the same whole to 8/9 of the same whole. Now, you can see the way
that I've pre-drawn it. The circles are the same size, but I have divided them into a
different number of sections. Here, since I have
10ths, I've divided into, you see that I've divided it
into, one, two, three, four, five, six, seven, eight,
nine, ten sections. Over here, since we're dealing with 9ths, you can see I've divided
it into one, two, three, four, five, six, seven,
eight, nine sections. But let's think about
what 7/10 represents. It represents 7 of these 10 sections. So let me color them in. Let me get my coloring in tool. So that represents one, two, three four, five, six, seven out of the ten sections. Now what about 8/9? 8/9 is going to represent 8
of these 9 equal sections. One, two, three, four, five, six, seven, eight of those sections. So which one of these is larger? Which one is larger? Well you can see very clearly, remember we're using 8/9 of the same whole and 7/10 of that exact same whole. You see that we have
colored in more in magenta, or this pinkish color
than we have in blue. So 8/9 is the larger of these two. Or we could say that
7/10 is less than 8/9. And once again, the way I
remember what symbol to use, we always want it opening to the larger of the two number or the little, the tip is going to be pointing to the smaller of the two number. So, 7/10 is less than 8/9.