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Annoyed with his math teacher who assigns word problems and won't let him use a calculator, twelve-year-old Robert finds help from the number devil in his dreams.
Twelve-year-old Robert is annoyed with math taught by a boring teacher who will not allow calculators in class and frankly, the number devil (who appears in Robert's dream), agrees with him. Readers can truly feel the devil's enthusiasm for the subject in the language: "The thing that makes numbers so devilish is precisely that they are simple." The excitement is catching and some credit must be given to translator Heim, who is able to carry over a great deal of humor and sarcasm from the original German text. The number devil takes Robert on a journey of magical math concepts, and just as Dorothy awakens in Kansas, Robert awakens with his mother shaking him, "If you don't get up this very instant you'll be late for school." But Robert gets to keep a souvenir to prove his dream was real-something that helps him keep and use the knowledge he has gained.
A nice "Seek-and-Ye-Shall-Find-List" that is an index of math terms and mathematicians appears in the back, along with a "Warning" page pointing out a few liberties the author has taken and correcting them. Maybe math teachers will identify sparks in students and push this book; librarians will try.
VOYA Codes: 4Q 3P M (Better than most, marred only by occasional lapses, Will appeal with pushing, Middle School-defined as grades 6 to 8). 1998 (orig.
"Adults who know a little about math will find this book as enlightening as younger readers will." —Martin Gardner, Los Angeles Times
Besides, Robert had made up his mind to show the number devil that he was no fool. You have to put people like him in their place, Robert thought as he got ready for bed one night. The big ideas he has about himself--and all because of a zero. He wasn't much more than a zero when you got down to it. All you had to do was wake up and he was gone.
But to put him in his place Robert had to dream of him, and to dream of him he had to fall asleep. And Robert suddenly noticed he was having trouble doing so. For the first time in his life he lay awake in bed, tossing and turning.
"What are you tossing and turning for?"
All at once, Robert realized his bed was in a cave. There were weird paintings of animals on the stone walls, but he had no time to study them because the number devil was standing over him, twirling his walking stick.
"Rise and shine, Robert!" he said. "Today's our division day."
"Must I?" Robert asked. "You might have at least waited until I was asleep. Besides, I hate division.
"When you add or subtract or even multiply, things come out even. What bugs me about division is that you get this remainder."
"The question is when."
"When you get a remainder and when you don't. That's what counts. You can tell just by looking at them that some numbers can be divided evenly."
"Right. Like even numbers, which can all be divided by two. No problem. I'm pretty good at threes as well:
9 ÷ 3
15 ÷ 3
and so on. It's like multiplying in reverse:
3 x 5 = 15
15 ÷ 3 = 5
I don't need a number devil for that. I can do it on my own."
Robert shouldn't have said that. The number devil, his mustache quivering, his nose reddening, his head growing bigger and bigger, jerked Robert out of bed.
"What do you know?" the number devil shouted. "Just because you've learned the multiplication table you think you know all there is to know. Well, you know nothing! Nothing whatsoever!"
There he goes again, thought Robert. First he drags me out of bed, then he hits the ceiling when I tell him I can do division.
"Here I come to a rank beginner out of the goodness of my heart, and no sooner do I open my mouth than he starts making wisecracks! "
"The goodness of your heart!" Robert cried. All things being equal, he would have upped and left, but how do you up and leave a dream? He looked all over the cave, but could find no way to leave.
"What are you looking for?"
"A way out."
"If you go now, you'll never see me again! I'll leave you to choke on Mr. Bockel's pretzel problems, or die of boredom in his class."
Robert knew when he was licked.
"I apologize," he said. "I didn't mean to offend you."
"Good," said the number devil, his anger subsiding as quickly as it had come. "Now, nineteen. Try nineteen. See if you can divide it without a remainder."
Robert thought and thought.
"The only way I can come up with," he said at last, "is to divide it by nineteen. Or into nineteen equal parts."
"Doesn't count," the number devil replied. "It's too easy."
"Or divide it by zero."
"Out of the question."
"Out of the question? Why?"
"Because it's forbidden. Dividing by zero is strictly forbidden."
"What if I did it anyway?"
"Then all mathematics would come apart at the seams!"
He was about to lose his temper again, but he managed to pull himself together.
"Tell me," said the number devil, what would you get if you divided nineteen by zero?"
"I don't know. A hundred, maybe. Or zero. Or anything in between."
"But didn't you say when you were talking about the threes that division was like multiplying in reverse? If that's the case, then
3 x 5 = 15
15 ÷ 3 = 5
Well, now try that with nineteen and zero."
"Nineteen divided by zero is, say, 19. "
And in reverse?"
"19 times zero ... 19 times zero ... is zero."
"You see? And no matter what number you take, you always get zero. Which means you must never divide a number by zero."
"Okay," said Robert, "I give up. But what do we do with the nineteen? No matter what number I divide it by--two, three, four, five, six, seven, eight, or nine--I get stuck with a remainder."
"Come a little closer," said the number devil to Robert, "and I'll tell you a secret." Robert leaned so close to the number devil that his mustache tickled his ear.
"There are two types of numbers," he whispered. "The garden variety, which can be divided evenly, and the rest, which cannot. I much prefer the latter. You know why? Because they're such prima donnas. From the very first they've caused mathematicians no end of trouble. Wonderful numbers those! Like eleven, thirteen, or seventeen."
Robert couldn't get over how blissful the number devil looked. He might have had a piece of chocolate melting in his mouth.
Posted May 21, 2013
Posted February 24, 2013
Posted August 8, 2002
'The Number Devil' is a fun and educating math book about a boy named Robert who hates math but then likes and enjoys it because of the Number Devil. The Number Devil makes Robert love learning the great wonders that mathematicians discovered by teaching Robert very awesome math. For example, did you know that if you add the dots and spaces of a 2-D shape and subtract the number of lines used to make the shape you get 1? I recommend 'The Number Devil' to anyone who likes and hates math and everyone in between. 'The Number Devil' is a great book for all ages. I'm only 10!Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.
Posted March 5, 2002
THIS BOOK IS THE BEST I'VE READ IN A LONG TIME. I HIGHLY RECOMEEND IT FOR ANYONE FROM AGES 7 TO 407. THIS BOOK IS ESPECIALLY GREAT FOR PEOPLE WHO ENJOY MATH OR ENJOY READING. READ THIS BOOK, YOU WONT BE SORRY.Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.
Posted February 15, 2013
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