Posted by **Erica** on Sunday, July 13, 2014 at 2:25pm.

Math 221 - Ms. Sue, Sunday, July 13, 2014 at 2:24pm

I've done several problems for you. Now it's your turn.

How do you think this problem should be solved?

Answer this Question I was thinking that I should multiply the numerators and denominators

- Math 221 -
**Steve**, Sunday, July 13, 2014 at 2:37pm
as with most problems involving fractions, work first with the denominators. They cannot be added or subtracted unless they all have the same denominator.

5/12 + 7/9

The GCD(12,9) = 36. So, what you have is

15/36 + 28/36

Now all the "units" are the same. Just as you cannot add apples and oranges, you cannot add twelfths and ninths. But you **can** add a bunch of 36ths. Since 15+28=43, the final answer is just 43/36.

Or, if you must, 1 7/36

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