"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 NewsBecause 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 practical if mundane branch of knowledge best suited for filling out tax forms-but as a fascinating, sometimes surprising intellectual craft that arises from our desire to add, divide, and multiply important things. Passionate and entertaining, Arithmetic invites us to experience the beauty of mathematics through the eyes of a beguiling teacher."A nuanced understanding of working with numbers, gently connecting procedures that we once learned by rote with intuitions long since muddled by education...Lockhart presents arithmetic as a pleasurable pastime, and describes it as a craft like knitting."-Jonathon Keats, New Scientist"What are numbers, how did they arise, why did our ancestors invent them, and how did they represent them? They are, after all, one of humankind's most brilliant inventions, arguably having greater impact on our lives than the wheel. Lockhart recounts their fascinating story...A wonderful book."-Keith Devlin, author of Finding Fibonacci

Autorentext
Paul Lockhart is the author ofArithmetic, Measurement,andA Mathematician's Lament. After a career as a research mathematician at Brown University and the University of California, Santa Cruz, he spent two decades teaching algebra at Saint Ann's School in Brooklyn.

Klappentext

Paul Lockhart reveals arithmetic not as the rote manipulation of numbers but as a set of ideas that exhibit the surprising behaviors usually reserved for higher branches of mathematics. In this entertaining survey, he explores the nature of counting and different number systems Western and non-Western and weighs the pluses and minuses of each.