Costello comes up with three different ways to prove that 7 times 13 equals 28. If you look and listen closely, you'll find an amazing amount of number play in those old Abbott and Costello movies. The cow in the classroom. Reinhold, A.G. 1997. J., and L. Smith.
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He is the author of The Mathematical Tourist, Islands of Truth, Newton's Clock, Fatal Defect, and The Jungles of Randomness. For children ages 10 and up.