This was also the topic of discussion last night on CHEX Daily (I'm not sure I convinced Mike Judson). I'm at the 28:18 mark, and you can also find the video here: https://youtu.be/mHZXHlC97P0?t=28m18s
This makes it all worth it:

The books I shared on the show were:
Seeing Symmetry by Loreen Leedy
Lemonade For Sale by Stuart J. Murphy
Math For All Seasons by Greg Tang
Just a Second by Steve Jenkins
Me Counting Time by Joan Sweeney
Ready or Not, Here I Come! by Teddy Slater
The M and M's Counting Book by Barbara Barbieri McGrath
If you have Math-related games, websites, apps or books to suggest, I'd love to hear them!
