I DON'T GET HOW TO DO THIS MATH!?

For numbers 1-9 the best and easiest way is to make the denominators the same with a multiple that is similar with both of them, preferably the least common multiple. After you find out that, you just add or subtract like it says. For number 10, you just make all of the fractions have the same common denominator (least common) and then the rest is pretty easy to figure out. I would have given you the answers except that I don't really have much time right now, and I think that its probably the best if I just let you figure out how to solve them yourself. Good luck.