What math related gift can I give an elementary school teacher?

Asked by finkelitis (1907) May 10th, 2007

I've been helping some teachers with math this year, and I want to give them goodbye presents that will be a source of good math ideas for the future. Suggestions? One possible candidate is the book "Games for Math," but that's just for K-3 graders, and I work with a fourth grade teacher too, as well as two 2nd grade teachers.