My son is 8 and is excited about April Fool's Day. The only mathy joke I know that he'd like is...
Q: Why was 6 afraid of 7?
A: Because 7 ate 9!
But that's not really an April Fool's joke. Anyone have any good ones I can 'share' with him?
[Pat writes about a good mathy April Fool's joke (at 1975), but it's not my son's speed.]