There a bigger one.
http://www.geocities.com/jphonexdd/33343.jpg
For the top puzzle start by filling in the rows or columns that already have three entries in it. For instance, the first column (the left-most one) says:
$\displaystyle \frac{1}{6} + \frac{7}{12} + x = \frac{5}{3}$
(if I read that right. It's kind of fuzzy.)
So solve for x. (I got 11/12.) You can also do the 4th column (the right-most one). Then things start falling into place. You can now do the third row down, etc.
I can't make much sense out of the bottom puzzle. It's too fuzzy for me to read, but it looks like it might be the same kind of thing, only with multiplication and division. So try to attack it in the same way.
-Dan