Homework Help: Math

Posted by Liz on Wednesday, January 20, 2010 at 9:55am.

Can you please explain this to me.

The problem is 7/16 - 3/20

First I have to find the common denominator which would be 80

How does the 7/16 become 35/80 (where does the 35 come from)
How does the 3/20 become a 12/80 (Where does the 12 come from)

35/80 minus 12/80

answer 23/80

Math - bobpursley, Wednesday, January 20, 2010 at 9:57am
7/16*5/5= 35/80

3/20 * 4/4= 12/80
Math - Liz, Wednesday, January 20, 2010 at 10:01am
I still don't get it???
Math - bobpursley, Wednesday, January 20, 2010 at 10:03am
What you dont understand it how to get a common denominator...

http://www.mathsisfun.com/numbers/common-denominator.html

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