Are you smarter than my third grader?

Mark sent me this brainteaser yesterday.  I never did figure it out on my own, but Joe only took about 10 minutes to get the right answer.
I’m sure it was just because I was cold.
Write this equation down on a piece of paper:
5 + 5 + 5 = 550
Now add a single, straight line segment [...]

Read Full Post »