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# Adding fractions (denominators 10 & 100)

Sal adds 3/10+7/100 by finding a common denominator. Created by Sal Khan.

## Want to join the conversation?

• Why do choose to make these videos for khan academy?
• Because Sal wants to help people and teach math to the world with this free and awesome website. That's a pretty good reason.
• who records the voice id like to know
• it is Sal
• sal is awsome
• but what if the numerator is bigger the denomanator? I mean like 16/10 + 6/100
• If your comparing numbers like 7/14 and 14/7 try multiplying the denominators into the same number, then multiply the numerator with the same amount that you multiplied for the denominator.For 7/14 you will get 28/28 and for 14/7 you will get 28/28.Then you see which numerator is bigger if none are then they are equivalent.
• hey whats the denominator again
• the one on the bottom.
• ok so this did help me and let me understand a little bit when the person doing the voice over is making it a little harder to ya know, understand? all im asking is for them to explain a TINY bit more... thankyou and hope you understand...
• Okay! Let's get a different situation. 7/10 + 4/100=?. We need to find out the sum. The first thing we need to do is that we need to make the denominators the same. We have to make the denominators 100, because you cannot divide 4 by 10 without decimals. So we times 10 by 10=100. Then we have to times the numerator by 10 too! 7x10=70. It becomes 4/100+70/100+?. Now, 70+4=74 so, the answer is 74/100. Hope this helps and have a good day!
• easy real darn easy
• maybe for you