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## Arithmetic (all content)

### Course: Arithmetic (all content)>Unit 5

Lesson 5: Comparing fractions

# Comparing fractions with like numerators and denominators

Created by Sal Khan.

## Want to join the conversation?

• Where did denominator and numerator come from? And who invented it? Also, who invented fractions? And when?
• how do i tell to use less or greater than? i am having trouble figuring it out and what i mean is sometimes i have like 4/5 and 1/2 obviously 4/5 is greater then i put the greater sign and check my answer but it says less than.. how can i know and remember which one to use?
• when did fractions become a thing?
(1 vote)
• You could find this with an internet search, which is what I did. There is evidence that fractions were used by ancient Egyptians in 1800 BC.
(1 vote)
• The denominator of a fraction tells you how many pieces / parts will make up a whole unit. If the denominator = 10, then 10/10 = 1 whole unit. The larger the denominator becomes, the smaller the size of each piece. 1/10 is larger than 1/100
Hope this helps.
• Is the bigger fraction always going to be smaller than the smaller fraction? Ex:3/4 > 3/9.
(1 vote)
• Yes the denominator of a fraction is bigger than the other it is smaller if the numerator is the same
(1 vote)
• Interesting video
I understood completely now
(1 vote)
• how do i get you as a avitar hopper?
(1 vote)
• so if i sead 3/5 is = to 2/6
(1 vote)
• have great day hope this made someone laff did i metion im realy in to body hair
(1 vote)
• Sal says 4/7 can be rewritten as 4 x 1/7. And 5/7 as 5 x 1/7. Can I always take the top number off and put a 1 there?
(1 vote)
• No. unless you want to do a longer problem. 4 x 1 = 4 right? so you can put 4/7. You can't put the 1 there unless the problem is telling you it really IS a 1. It is your choice if you want to make the problem a bit bigger.
(1 vote)