Think of a number.

Double it...

We have all played this kind of game—but how many of us realized that algebra is what makes it work?

Malcolm E. Weiss, in this inventive and amusing introduction to algebra for young children, shows that the "unknown," or X, can be the contents of a paper bag or pocket, or just the number you are thinking of.

With a word of caution about using large numbers (they make the arithmetic in the game harder), Mr. Weiss happily leads the reader to an equation with a pretty big answer. (See the title of the book.)

Judith Hoffman Corwin's illustrations help to clarify the problems and make 666 JELLYBEANS! ALL THAT? a handsome book to read and share.

From the dust jacket