Thanks for posting. I'm trying to keep a collection of these type of things so that when she's ready, it'll be another tool to get/keep my daughter excited about math.
Care to share? Would be handy to have for my daughter... :)
I'll start a post when I have enough worth sharing. She's 4 now and we're still working with basic math. I've found a few books that incorporate math that she's enjoyed; right now we're halfway through The Phantom Tollbooth. Milo just left Dictionopolis so we're headed to Digitopolis shortly...
Make sure you show her Gauss’s trick for summing arithmetic series.