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Sayı Şeytanı

3.88 of 5 stars 3.88  ·  rating details  ·  2,836 ratings  ·  358 reviews
The international best-seller that makes mathematics a thrilling exploration.

In twelve dreams, Robert, a boy who hates math, meets a Number Devil, who leads him to discover the amazing world of numbers: infinite numbers, prime numbers, Fibonacci numbers, numbers that magically appear in triangles, and numbers that expand without . As we dream with him, we are taken further
Paperback, 200 pages
Published 1999 by Can Yayınları (first published 1997)
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Kelly H. (Maybedog)
Random math thinly disguised as a novel. I get what it's trying to do but it feels more like the kind of characters that kids' textbooks have to make the info more "fun." there isn't a plot here. But if it gets kid's reading about math then go go go. Plus, the illustrations are really cute.
I love the idea of a novel that relies on and promotes interest in math, but the execution here just fell way short for me. The story itself - that a boy who hates math learns to like it through a series of dreams in which he interacts with a Number Devil - is a little thin and repetitive. But what I found bothered me the most were the explanations of the math concepts. I've seen some great nonfiction books that make math concepts interesting AND explain them in multiple ways for students who ca ...more
Imagine that a math teacher wanted to write a children's book to show kids how cool math really was; but since it's a math teacher and not an English teacher doing the writing, all you end up with are math concepts written out in analogies similar to what you'd hear in a math classroom -- that's what this book is like. The story is about a boy named Robert who hates his math class and math teacher and by extension math in general. He falls asleep and over a series of twelve different dreams over ...more
David Madrigal
This book was by far the most interesting book I have read in years. I found it really interesting as the concepts in mathematics were very interesting, yet explained in simple terms. (view spoiler) ...more
Lance Greenfield
This book makes maths fun, even for those little people who believe it to be a laborious trudge through treacle. In fact, that would describe Robert, the main character in this book. He has been struggling with maths for as long as he can remember. One night, he dreams that he meets a little devil, The Number Devil, who teaches him, as he sleeps, all sorts of useful tricks with numbers.

When you enjoy something, and gain immediate benefit, you obviously learn more.

My Dad made all aspects of mathe
Great book.

It talks about maths in a way that is as simple as 1+1=2.
I was way behind in maths going into high school, and I have learnt so much from this book in 1-2 months.
I learnt stuff like Fractions, Bonacci/Fibonacci numbers, Decimals, Factorial (Vroom!), Hopping numbers, Prima Donnas, and Triangle numbers.

My favorite was the "Hopping Numbers". I spent a good part of a day just writing them all down. I wrote down 55 hopping numbers, and the biggest one I did was 18,014,398,509,481,984, whic
José Luis

No creo que leer El diablo de los libros pueda hacer que un niño al que no le gusten las matemáticas empieza a apreciarlas, pero estoy convencido de que no era esa la intención del autor al escribir el libro, sino más bien crear una historia entretenida con las matemáticas como hilo argumental en la que se nos muestran curiosidades y aspectos llamativos de las mismas que puedan despertar posteriormente el interés de los chavales.

Me ha resultado muy curiosa
Yuta .
Count as 2 books (Review 3 and 4)

I have read the book "The Number Devil" because my grandpa sent it to me from Japan in Japanese translation. The book was amazing. This book made me like math and this is when I first understood radicals and other mathematic things. I will tell you that, by the time you finish this book, you will think "Oh, math is so cool!".


In the book, Math Devil teaches math to this boy named Robert (Who hate Math),many interesting facts about math, and the secret be
Jason Hamilton
This book is a thinly veiled novelization of a few math problems. It's wrapped in a story about a boy with crazy dreams that begins dreaming about math and learning things from a number devil.

My impression was that the book got the formula all wrong. The story is nonsensical and tedious, so you're ready to get to the math. The math is then explained via conversation between the main character and the number devil, so you really have to reflect on the topics after each chapter to understand them.
Anne Hamilton
...But as he stood in front of his mirror in his pajamas, brushing his teeth, he felt something tickling his chest and looked down to see a tiny five-pointed star on a thin golden chain. He couldn't believe his eyes. This time his dream had come true! ...After he'd dressed, he took the chain off and stuck it in his pocket: he didn't want his mother asking silly questions. ...Where'd that star come from? she'd want to know the minute she saw it. Boys don't wear jewelry! ...How could he tell her
I really enjoyed The Number Devil. I thought that it was a worthwhile book and if you are having trouble in math, it can really help you. I thought that the book was very good in its way of delivering the information. Robert, the main character, is always asleep when he is with the Number Devil and in his dream world, math is completely different from ours. One thing i didn't really like about the book is how they do not always use real math terms. They use words like coconuts and rutabagas and ...more
This summer I decided to read the book The Number Devil: A Mathematical Adventure by Hans Magnus Enzensberger. The story is about a boy named Robert who hates math because he finds it very boring at school. He keeps dreaming about being eaten by a giant fish or sliding down a never ending slide until one night he suddenly finds himself dreaming about meeting the Number Devil (Teplotaxl). During the twelve nights Robert finds himself learning different mathematical principles every night.
In the
Jairo Guzman
Enzensberger tells a story of Robert, a young boy with mediocre math skills, and his journey through the world of mathematics under the tutoring of the number devil, a black-bearded, irascible, red man. In Enzensberger's The number devil, the boy Robert is able to contact this devil through 12 dreams and learns that math isn’t that bad at all. The whole purpose of this book is to reveal to young people that mathematics is something worth exploring and not just a sadistic intellectual exercise ma ...more
Ini bukan dongeng, bukan pula memoar. Tapi kejadian-kejadian yang ada dalam buku ini bisa saja Anda alami di kehidupan Anda.

Perkenalkan Robert, seorang anak berumur 12 tahun yang sangat membenci matematika dan terutama guru matematikanya. Baginya angka-angka dan segala macam hitung-hitungan adalah hal yang menjemukan. Tapi, pandangannya tersebut perlahan-lahan berubah sejak bertemu Setan Angka dalam mimpinya. Dari malam ke malam Setan Angka mengajaknya bertualang menjelajahi dunia matematika. Se
Grazie mille Enzensberger!
Sapevo che la matematica può essere divertente (anche se i professori evitano accuratamente di farti conoscere questo lato) ma che fosse così spassosa, quello no, non l'avrei immaginato. Dodici notti, dodici sogni per insegnare a Roberto come funzionano le cose e che alla fine non è il caso di avere paura. Robero è fantastico! Il modo di rispondere, di fare, non sembra un bambino di 10 anni, come tralatro si evince anche dalla copertina (anche perchè esprimo qualche pe
What do you get when you cross Alice in Wonderland with a small, red, horned man obsessed with numbers? No, it isn't an arithmetic problem - it's a middle school math primer!
Robert, a boy who hates math and is frustrated because his teacher doesn't allow calculators, has strange dreams all the time. One night he dreams up a character called the Number Devil, who takes him away to a surreal world of numbers where Robert learns basic math concepts and a few handy shortcuts. After all, says the Num
A cute book that holds many of the same principals as Magic House of Numbers, but is written with a middle school/very late elementary school audience in mind.

Some great (and advanced) mathematical ideas are presented in here. These include some ideas as young as Russel's Paradox or Countable Infinities. Others are much older (Pascal's Triangle and Diagonal length of squares). All of this told in a quiet, simple manner akin to Daniel Quinn's Ishmael - though a little more entertaining than that
I always struggled with mathematics, and because of that I also did not particularly like them. However, this book made numbers fun! And the story simple and with a touch of magic from the incredible dreams made everything even more entertaining.

I am thanking my brother for lending me the book, this was a nice ride.
Zahra Dashti
خیلی کتاب خوبی بود. اگه ریاضیات و بازی با اعداد و این تیپ چیزها رو دوست دارین بخونیدش. مخصوصا برای نوجوانها عالیه. دنیای زیبایی رو براشون از اعداد به تصویر می کشه و به شیوه شیرینی بهشون اطلاعات می ده در مورد علم اعداد و ریاضیات.
با اینکه از سن من گذشته بود وقتی خوندمش ، ازش خیلی لذت بردم!
This book has the same artist as one of our favorite children's books: In the Town, All Year Round.

I'm not sure what to say about this one. Who would I recommend it to?

Not math people - The terminology will drive this reader crazy! The author took math terms and called them something else. For example, instead of "the square root of 9 equals 3," it was "the rutabaga of 9 equals 3." OOOOOOOOKKKKKKKKKKK!

Not non-math people - 1. With the strange verbiage, you won't be able to talk to other people,
Math books written in plain English are difficult to find. Math books written in plain English that are also entertaining are nearly nonexistent. Thankfully, there's this one.

I wish I found this book when I was a kid. if I had. my grades probably would have been a lot better than they were.
Very interesting concept. I was expecting something along the lines of The Phantom Tollbooth but this book doesn't even come close to that level of whimsical profoundness. I was definitely disappointed. The encounters between the dreaming child Robert and the Number Devil quickly become repetitive and stale. The author is trying to make children realize for themselves that mathematics are beautiful but the execution of this goal is actually quite ordinary. This book is recommended for kids 10+ b ...more
I really liked this book (and learned a lot from it!) and I really hate math. I mean, really. I have a real fear of numbers, and this book felt good.
Shaima Mannan
The Number Devil

I would give this book 4 stars because it's a great book which is very educational. I think it would be great for ages 10-12. It really takes the topic of math and algebra and makes into something more interesting and informative at the same time.
This book is a bit corny,to be honest it really is sort of childish but that's what I found to make this book very interesting. It's about a boy who is having these nightmare's about math and this "number devil" appears and tries to h
Jungmin Lee
A boy who hates math is forced to learn a lot so he can pass math class at school. A math genius called a number devil must enter the boy's dreams and teach him from the basics to Algebra.
I am glad I read The Number Devil. I even learned some words and problems that I never even solved before. A theme I acquired is that not even trying to do something that someone doesn't like also means being too lazy. Apparently, the main character just slacks off in class, staring into space. What was annoy
Raka Nouvel
Melihat judulnya sempat terpikir bahwa ini semacam fiksi horor.

Horor? Ya, dengan warna merah yang bernuansa seperti darah, cover dengan judul Setan Angka ini memang sempat membuatku berpikir, "Is that a horor fiction?"

Fiksi? That's true, but horror, absolutely NOT.

Hans Magnus menulis sebuah cerita fiksi tentang matematika. Ya, tentang hal yang kata sebagian orang merupakan pelajaran yang menyebalkan. Rupanya Hans ingin mengajak anak-anak di seluruh dunia yang tidak menyukai matematika menikmati
Author: Hans Magnus Enzensberger
Illustrator: Rotraut Susanne Berner
Translator (German to English): Michael Henry Heim
First Published: 1997

For Christmas the 7yo was given the gift of maths, the magic of numbers from a much loved aunt.

Each Day Robert has a dream visit from the Red Devil where he is gifted with a mathematical concept.

Daughter's Review: I liked it because it combined fiction with non fiction and I like Maths. I really liked the pictures maths trick [Day 10].

Day 1: Concept of biggest
I give it a five as a children book. It is not the most elaborate prosa - not even for children literature - but that's not its purpose. And as a book aiming to bring children closer to mathematics it works just fine.

I read this book many times as a child myself and eventually went to uni for a mathematics degree (not that the book pushed me towards it, maths was already my fave subject at school anyway). But I think this book makes mathematics seem more approacheable, sometimes even fun, and it
This was a good book. It was a good book because it taught me some stuff I did not know about math. The book taught me about all different types of mathematical stuff like pie numbers, triangle numbers and much, much more.
I thought it was really good! The Number Devil teaches you about math, like Pascal's triangle or Fibonnachi numbers. They break it up into sections and on each night the boy Robert learns something new. The beginning of the story is that the boy Robert is stuck in a boring math class with his teacher Mr.Bockel who, whenever the class is not looking, takes a pretzel from his bag and crams it in his mouth! The Number Devil appears in Robert's dreams. Robert was surprised that The Number Devil came ...more
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