math&calcs book 4 kids, any suggestions?

[Luigi Vampa]

I would be very grateful, if any forum member could suggest a book to introduce math by means of a regular scientific calculator. It is meant for an 11 years-old kid, who is the son of a friend of mine. This kid is very good at math, and I would like to give him a Casio FX82 + this book, so that he can play with both of them next summer holidays.
Needless to say, English language isn't an issue at all.
Thanks in advance for your help.