Just spell it out for him, and do that math for him.
The 52 strength he gave that guy isn't a mathematical mistake though. However, I don't think doomboy took the fact that all that guy needs do is punch one of us and we explode. You know, since like... none of us has over 15 HP... and a 21 Strength bonus is therefor, disgusting... unless he intends to kill the party. Because one of these times I'm going not going to get lucky, he's going to get free, and unless I manage to grapple him again... we are all going to die.

However doomboy, it's grapple checks, not strength checks to get out of a grapple.