Originally Posted by

**Jonboy** 7/9 plus 2?

Adding fractions requires getting like bottom numbers. So (7/9) + (2/1) hs the bottom numbers of 9 and 1, we multiply those two and get 9 (this always works but is not always the simplest).

So now you multiply the top and bottom of (2/1) by 9 since whatever you do the top of the fraction you have to do that to the bottom getting you (18)/(9).

We don't do anything to (7/9) since it's already got a 9 on the bottom.

Now we just add the top numbers and keep the bottom number, 9.

$\displaystyle \frac{18 + 7}{9} = \frac{25}{9}$