Numbers & Operations - The Real & Complex Number Systems 189-200
- Comparing fractions with > and < symbols
- Comparing fractions visually
- Compare fractions with fraction models
- Compare fractions on the number line
- Comparing fractions with the same denominator
- Compare fractions with the same denominator
- Comparing fractions with the same numerator
- Compare fractions with the same numerator
- Compare fractions with the same numerator or denominator
Sal shades visual fraction models to compare fractions. Created by Sal Khan.
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- So if you had 12/12, would that equal 1 whole?(42 votes)
- How can 3/4 be larger than 3/7? 3/4 has a smaller denominator. Can someone help me?(7 votes)
- If you have a bigger denominator it is smaller because then you have more parts, and that makes it smaller. fractions can also be turned into decimals, so 3/7= 3 divided by seven, which is about 0.4285. but 3 divided by 4 is 0.75.(16 votes)
- I understand what <,>, & = equals, but what does the < and > mean with a line under it?(2 votes)
- Do you mean ≤ and ≥?
≥ is equal to or greater than. For example, you could use 2 ≥ 1 or 4 ≥ 4.
≤ is equal to or less than. For example, you could use 5 ≤ 8 or 8 ≤ 8.
Hope this helped! <3(10 votes)
- wait but what if the 3/7 pieces where much bigger than how sal cut them and the 3/4 where the same so you cant always know. Is there an other operation that tells you what to do with that.(8 votes)
- As mentioned in prior discussions, you have to assume the whole units are the same size. If they aren't, the problem will tell you they aren't and you will need to convert them to units that are equal size. For example: We don't compare liters and gallons without converting to a common unit of measure. You need either both numbers in liters or both numbers in gallons to work with them.(8 votes)
- Is 9 tenths subtract 1 third greater than 1 half(4 votes)
- convert the two fractions so that they have a common denominator. The common denominator here is 30(11 votes)
- Are fractions like division(5 votes)
- what if you already know this stuff but you're still doing it, what if you're in college and you still have to do this stuff?(2 votes)
- Most jobs and many life skills require that you understand basic math. This is basic math. So, if you want to succeed and be able to move on to better things, learn it.(10 votes)
- why is comparing and contrasting so important if your not solving or doing anything but says f they are the same or not or equal to..(4 votes)
- You are still technically answering what the question is, whether this fraction is bigger than the other. It's just that the answer is not a number.
Also, knowing which fraction is bigger will help later on, such as subtracting fractions with different denominators.(6 votes)
- How do you remember that the top is the numerator and the bottom is the denominator?(3 votes)
- I can think of it as the top is "New" and the bottom as "Den"
The numerator has sprung out of the floor, "New" as ever.
The denominator is under the line, so it is in it's "Den"(5 votes)
- Can you simplify 5/30?(3 votes)
When you write a fraction, there are actually words for the top number and the bottom number. And the words are a lot more fancy than the word "top number" and "bottom number." What mathematicians typically use is the word "numerator" for the top number and "denominator" for the bottom number. And what I want to do now that we know that the top number is the numerator of the fraction and the bottom number is the denominator, I want to compare pairs of fractions that have either the same denominator or the same numerator. So let's look at this first pair. I want to compare 4/7 to 3/7. And I have two wholes right over here. They're the same hole, and I've divided them into sevenths. I've divided them into 7 equal chunks. And I want to see what's larger, 4/7 or 3/7. So what I can do is, I can fill in 4/7. Let me select 4 out of the 7. So, that's 1, 2, 3, 4. And the fact that trying to even get to 4/7 I had to have 3/7 first gives you good clue that 4/7 is probably larger, or it is larger. But now let's color in 3/7, just so we can compare. So 1, 2, 3/7. And so it's pretty clear that on the left-hand side, we are shading in more of the whole than on the right-hand side. So, 4/7 represents a larger fraction, more of the whole than 3/7. And the way that we can state that comparison mathematically is with the greater than symbol. We can write 4/7 is greater than 3/7. Now, the greater than and less than symbols can sometimes be confusing. This is greater than. This is less than. And the way that I remember it is that the greater than symbol, either symbol, the small pointy side is always on the side of the smaller number, and the big open side is always on the side of the larger number. So here, big open side is opening towards the 4/7, small pointy side opening to the 3/7. 4/7 is greater than 3/7. Now, what about 3/7 and 3/4? So, here I have different denominators, but I have the same numerator. And so I encourage you to pause this video and draw maybe little boxes like this and try to judge for yourself which of these is a larger fraction, represents a larger number. Well, let's color them in. So, let's think about 3/7 first. And we actually already drew it here, but I can do it really fast right over here. So that is 3/7. I've colored in 3 of the 7 equal groups. And what would 3/4 be? Well, that's 1/3, 2/4, and 3/4. And so it's pretty clear that 3/4 represents a larger fraction of the whole, that 3/4 is larger, or that 3/7 is smaller. So we could write that 3/7 is less than 3/4. So, notice, same exact numerator. When I divided it-- because this fraction symbol could also be viewed as division. When I have it as more equal groups, so it's a fraction of more equal groups, so 3 out of 7 versus 3 out of 4, this is a smaller number, which which makes sense. Now, let's compare these two. We have the same denominator, different numerators-- 3/4 versus 2/4. Well, 3/4 we've already looked at. We can just shade in 3 of these. So 3 of these fourths. So that's 3/4 right over there. And then 2/4, well, we're going to only have 2 of the fourths, 1, 2. So 2/4 is clearly the smaller number. 3/4 is the greater number. So, once again, we could write 3/4 is greater than 2/4. And then finally, I encourage you to pause the video. Try to come up with whether 2/4 or 3/6 is a larger number. Well, let's color it in again. We've already seen 2/4. We just have to color in 2 of our fourths. So let's just color in 2 of our fourths right over there. And then 3/6, we've split our whole into 6 equal sections-- 1, 2, 3, 4, 5, 6. We need to color in 3 of them. And as you see, we're coloring in the exact same amount of the whole. These two fractions are equivalent. These are equivalent fractions. 2/4 is equal to 3/6. And as you see here, they're both filling in half of the whole. If we were to just draw the whole and split it only-- let me do this in a different color. If we have our whole, and we were to split it only into two sections, we are shading in exactly 1 out of the 2 sections. So you could say that 2/4 is equal to 3/6, and they both equal 1/2. So 1/2 is equal to 2/4 is equal to 3/6.