Hi Kriston,

Great! I love when that happens.

Have you tried teaching x! (x factorial, as opposed to Hurray for x!) ?

My DS8 asked about it the other night and got very into the idea:

DS8: "Hey, what's this exclamation point on the calculator for?"

<explanation from Mom and other adult>

DS (considering the implications): "Cool!"

The wikipedia has a cool entry on factorials. It has a nifty table with factorial values on the top right. The mathematics below the top part is a bit advanced though.

Val