One evening about a month ago, my six year old brother asked a question that was designed to stump the oldest of us. “What’s fifty times fifty?” He loves starting with the hardest number to multiply that he can fathom, and then multiply that by itself, the new number by itself again, and keep going—until even the calculator groans and returns an E+, ‘Overflow’, or simply starts showing uninterpretable decimals.
But since fifty times fifty isn’t too big, I set it up on the whiteboard for him and gave him the answer. “Two thousand five hundred.”