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By alecn
via java.dzone.com
Published: Jan 31 2014 / 10:38

Imagine yourself as a child at a chalkboard learning to multiply. Your teacher asks you to write one number over another, and then to draw an “x” and a line below. The author was surprised to learn that Ruby multiplies large numbers (Bignum’s) the same way you learned in fourth grade: one “digit” at a time.
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