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• My son loved this book. I also had an autistic student who took an interest in it and it was a breakthrough.This is an amusing story that tells alot of math facts and concepts without the fear and loathing. It makes math fun and interesting. even for adults.

  5.00 out of 5

  mmmoss

• There aren't a lot of entertaining stories about math, which already sets this little jewel of a book apart. Yes, plenty of books for kids think they are going to teach you something. And some of them even do, sort of. But most of those are setting out to teach you something you will come across in elementary school. This book doesn't teach you any old math. It goes all the way to COLLEGE math-- and yet it remains not only easy to understand, but entertaining and *funny*. I guarantee, if you read it and enjoy it, you will be able to blow away your math teacher. The author, Hans Magnus Enzensberger, is considered one of the great writers of the German language writing today, but this is one of his only books for kids. If you read it, you'll see why he's considered a fine writer. And maybe you'll be interested in some of his 'grown-up' works as well.

  4.50 out of 5

  shoebacca

• "A mathematical adventure" -- and what an adventure this is. Aimed at children, the story (in which twelve-year-old Robert dreams nightly about a "number devil" who shows him the wonders of mathematics), this is a wonderful introduction to the magic of number theory, nicely illustrated by Rotraut Susanne Berner. It reminded me (40 years on) of many of the things that I found enticing about mathematics at about that age. [Jan 2001]

  4.00 out of 5

  pamplemousse

• The reason we picked this book up was to help the kids see math as fun and interesting and this book certainly did the trick. It didn't tie in to anything we were learning because the concepts were quite advanced but it illustrated several ways numbers are just amazing and how they sometimes make perfect sense and other times don't. My husband, who is a numbers guys, found it intriguing as well. I think we will go back to this book again and again.

  4.00 out of 5

  momma2

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