Download presentation

1
**by Hans Magnus Enzensberger**

THE NUMBER DEVIL by Hans Magnus Enzensberger

2
**Robert has a new teacher – Mr. Bockel. **

Mr. Bockel loves to eat pretzels. He also loves to torture Robert with problems about Robert’s least favorite thing . . . This is the story of Robert . . .

3
NUMBERS! 1 5 2 7 4 9 Luckily for Robert, he meets in a dream someone who can help him

4
THE NUMBER DEVIL!

5
The First Night

6
**The thing that makes numbers so devilish is that they are simple.**

All you have to do is start with one. You can make all of the numbers out of one. Try it! 1 x 1 = 1

7
**What do you think will happen if you do this?**

Now try: 11 x 11 = 121 Now try this: 111 x 111 = 12,321 What do you think will happen if you do this? 1,111 x 1,111 = 1,234,321 or this: 11,111 x 11,111 = 123,454,321

8
**How many ones do you need to multiply to get a six?**

Now You Try! How many ones do you need to multiply to get a six? 111,111 x 111,111 = 12,345,654,321 What about 7, 8, and 9? 1,111,111 x 1,111,111 = 1,234,567,654,321 11,111,111 x 11,111,111 = 123,456,787,654,321 111,111,111 x 111,111,111 = 12,345,678,987,654,321

9
The Second Night

10
Although The Number Devil showed Robert how to make all of the numbers from one, something is still missing . . . Do you know what it is?

11
**1986 = MCMLXXXVI They wrote their numbers like this:**

Zero was the last number to be discovered. The ancient Romans didn’t have zero. They wrote their numbers like this: 1986 = MCMLXXXVI

12
**Our numbers are much easier to write because we use zero, and our numbers hop.**

13
**Number hopping is really easy!**

Try one: 1 = 1 1 x 1 = 1 1 x 1 x 1 = 1 Don’t see it?

14
**Number Hopping Try Two: 2 = 2 2 x 2 = 4 2 x 2 x 2 = 8**

See it? 21 = 2 22 = 4 23 = 8 24 = 16

15
**Now make 10 hop four times:**

Number Hopping Now try it with 10: 101 = 10 102 = 100 103 = 1,000 Now make 10 hop four times: 104 = 10,000

16
**Number Hopping That’s the beauty of zero.**

It lets you hold a space and move on. You can always tell a number’s value by it’s position: The farther to the left it is, the more it’s worth; the farther to the right it is, the less it’s worth.

17
**Number Hopping 6 + 80 + 900 + 1,000 = 1986 Remember 1986?**

Here’s how it hops: 6 x 1 = 6 8 x 10 = 80 9 x 100 = 900 1 x 1,000 = 1,000 ,000 = 1986

18
The Third Night

19
**We cannot divide by zero. It is strictly forbidden!**

Now that we know about zero, there is one thing we cannot do with zero! Any guesses? We cannot divide by zero. It is strictly forbidden!

20
**On this third night The Number Devil decided to tell Robert a secret.**

Now that we’ve dealt with zero and one, what about the rest of the numbers? On this third night The Number Devil decided to tell Robert a secret.

21
**There are two types of numbers - **

the garden variety, which can be divided evenly, and the rest, which cannot. These numbers are such prima donnas! Let’s see if we can find all the prima donnas up to 50.

22
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 First we take out all of the even numbers because they are divisible by 2. Don’t forget that 2 is a prima donna number.

23
2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Now do 3. 3 is a prima donna number, but we can take out all the other numbers divisible by 3.

24
**5 is a prima donna, so take out all the numbers that end in 5.**

2 3 5 7 11 13 17 19 23 25 29 31 35 37 41 43 47 49 We don’t have to bother with 4 because 4 is 2 x 2, so they are already gone. 5 is a prima donna, so take out all the numbers that end in 5.

25
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 49 We can forget about 6, 6 is 2 x 3, but 7 is a prima donna number so take out any numbers divisible by 7.

26
**Well, there you have it – the prima donnas! 2 3 5 7 11 13 17 19 23 29**

31 37 41 43 47 Well, there you have it – the prima donnas!

27
**Get the book! Curious? See how helpful The Number Devil was to Robert?**

Want to see what else The Number Devil shows Robert? Want to know The Number Devil’s name? Curious? Get the book!

28
**by Hans Magnus Enzensberger**

THE NUMBER DEVIL by Hans Magnus Enzensberger

29
**Technology & The Number Devil**

Robert used a calculator to help him with The Number Devil’s lessons. The first mechanical calculator was invented in 1642 by the French Mathematician Blaise Pascal. He called it The Pascaline.

Similar presentations

Presentation is loading. Please wait....

OK

I can carry out simple percentage calculations.

I can carry out simple percentage calculations.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To ensure the functioning of the site, we use **cookies**. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy & Terms.
Your consent to our cookies if you continue to use this website.

Ads by Google

Ppt on zener diode application Ppt on fibonacci numbers in stock Ppt on high voltage engineering lectures Ppt on creativity and innovation management concept Ppt on jindal steels Ppt on condition monitoring pdf Ppt on tamper resistant nuts Ppt on solid dielectrics definition Ppt on antibiotic resistance mechanism Ppt on paintings and photographs related to colonial period in american