Date: Thu, 3 Apr 1997 23:31:13 -0500

From: Alexander Bogomolny

Jerry:

* is the plain multiplication. The thing that looks as the check mark is the square root. Sorry if that's not clear. Just in case, [] means "the whole part", i.e., the largest integers that does not exceed a given number.

You may want to look into

From Arithmetic and Algebra:

- Three glass puzzle
- Hour glass timing
- Selfreference
- Mathematical proof
- Breaking Chocolate Bars

From Geometry

- Moebius strip is funtastic for kids
- Cycloids is a drawing fun
- Shapes of Constant Width
- Indexing of Julia Sets

Among Games (activity not theory):

- Fif
- Sending scouts into desert
- Peg Solitaire
- Magic Squares
- Nim

Other puzzles may also be entertaing for a 7 year old. Mind you math is not just counting.

Time permitting, tell me if they like anything particularly.

Alex

67086918