The answer I will give is an approximate number, but it will be close. The problem is that every periodic table is slightly different. Some round as I will, and some carry the mass of the elements out to 3 decimal places. You should go back and put the correct numbers in to the mass that I use.
Formula
KOH
Givens
Solution
Molar Mass = 39 + 16 + 1
Molar Mass = 56 grams / mole