Over a decade ago when I was student teaching one of the math teachers had this great series of math workbooks.  At the top of the sheet was a riddle or joke.  Then there were math problems.  Each answer to a math problem would correspond to a letter.  When you put the letters in the correct order, it would give you the answer to the riddle/joke.  The kids loved doing these worksheets! I'm going to start tutoring math in the fall (gulp) and would love to have these workbooks.  I've been to 3 teacher supply stores, and no one has ever heard of them.  One woman said they must be discontinued.  I'd love to hunt for them, but I have no idea what the titles might be.  Does anyone have any ideas?  Thank you!