Arithmetic

“Inspiring and informative…deserves to be widely read.”
—Wall Street Journal

“This fun book offers a philosophical take on number systems and revels in the beauty of math.”
—Science News

Because we have ten fingers, grouping by ten seems natural, but twelve would be better for divisibility, and eight is well suited to repeated halving. Grouping by two, as in binary code, has turned out to have its own remarkable advantages.

Paul Lockhart presents arithmetic not as rote manipulation of numbers—a ...