“Perfect for parents who want to understand the different methods to do arithmetic their children are learningーand why they are being taught that way.”
ーKeith Devlin, award-winning Stanford Univer……続きを見る
Entertaining word problems that let verbal types master the language of math!
Math is a universal language, but it's also the least understood and most undervalued subject taught in school. Two Trai……続きを見る
