Think of a number with two digits. For example, 43. Follow the Magic Gopher's instructions and he will amaze you by telling you what number you chose.

436
Total votes: 10204
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Discussion

Did he get your number right? How does he do it?!

Comments

Solver's picture
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Solver 3 June, 2017 - 18:14

It's pretty easy he says pick a 2 digit number wich all of them equals with the numbers equal to the number nine.

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10 users have voted.
catastrophe's picture
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catastrophe 5 May, 2017 - 17:34

Yeah, he gets it right... because, look, if you try to add both the digits of a two digit number, and subract it with the original, it always gives a multiple of nine. And if look in the paper that the gopher gives us, it has the same symbol for the multiples of nine. He changes the card each time because we'll get a doubt if the same symbol comes again and again.
For example:
65= 6+5=11
65-11=54
54=6*9
Another one:
79=7+9=16
79-16=63
63=7*9
And even though it's the same multiple, you'll get different symbols...
PS: Please don't take this in the wrong way. I don't want to criticise the game. It's just that I've figured out the logic:)

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48 users have voted.
tsunami2011's picture
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tsunami2011 17 April, 2017 - 11:01

Of course he gets it right. You subtract the two nubers added from the original number. Example: 43. You subtract 4+3. Instead of taking 43-7, take 43 -3 -4. You will get the same answer. However this proves that no matter what nuber you choose you will always subtract the second number (in this case 3) to get a number that ends with 0 (in this case 40). Then the nuber you subtracted second can only be 1, 2, 3, 4, 5, 6, 7, 8 or 9 And the only possible outcomes will be, 90 - 9 = 81, 80 - 8 = 72, 70 - 7 = 63, 60 - 6 = 54, 50 - 5 = 45, 40 - 4= 36, 30 -3 = 27, 20 - 2 = 18 and 10 - 1 = 9. You might notice that all of these numbers are in the 9's multiplication table. That is because when multiplying by 9 you can instead multiply by 10 and subract the other number. For example: 5*9 = 5*10 - 5 = 50 - 5 = 45. First you add one 5 and then you subtract it again. 9*5 = 9*5 + 5 - 5.And all the symbol 90,81,72,63,54,45,36,27,18 and 9 are the same .

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40 users have voted.
summerlover's picture
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summerlover 15 January, 2017 - 20:37

How amazing !!! That is definitely wonderful ! OMG !! How could he do it ??! i'm gonna be crazy

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63 users have voted.
mavis2002's picture
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mavis2002 22 December, 2016 - 21:45

Hi I can't play with this one.
It shows only white screen!!
I can play last time but now I can't ?why?

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74 users have voted.
JoEditor's picture
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JoEditor 23 December, 2016 - 09:27

Hi mavis2002,
Thanks for your message. Sorry you can't see the Magic Gopher. I have tested the game and it's working for me. Can you tell me please what device you're using and which browser and I will check it again. 
Best wishes, Jo (LearnEnglish Teens Team) 

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60 users have voted.
Natxu1303's picture
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Natxu1303 15 November, 2016 - 17:39

I can not play with any of your games , the only thing that appears in the screen it is a blank space for all the games

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81 users have voted.
Tina - Coordinator's picture
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Tina - Coordinator 16 November, 2016 - 11:10

Hi Natxu1303,
Thanks for letting us know. I've just tested it and it's working fine for me. We have been having some problems with this game but now it's working again :) I hope it is for you!
Best wishes, Tina (LearnEnglish Teen Team).

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80 users have voted.
Tho55's picture
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Tho55 14 October, 2016 - 08:27

Of course he gets it right. You subtract the two nubers added from the original number. Example: 43. You subtract 4+3. Instead of taking 43-7, take 43 -3 -4. You will get the same answer. However this proves that no matter what nuber you choose you will always subtract the second number (in this case 3) to get a number that ends with 0 (in this case 40). Then the nuber you subtracted second can only be 1, 2, 3, 4, 5, 6, 7, 8 or 9 And the only possible outcomes will be, 90 - 9 = 81, 80 - 8 = 72, 70 - 7 = 63, 60 - 6 = 54, 50 - 5 = 45, 40 - 4= 36, 30 -3 = 27, 20 - 2 = 18 and 10 - 1 = 9. You might notice that all of these numbers are in the 9's multiplication table. That is because when multiplying by 9 you can instead multiply by 10 and subract the other number. For example: 5*9 = 5*10 - 5 = 50 - 5 = 45. First you add one 5 and then you subtract it again. 9*5 = 9*5 + 5 - 5.

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117 users have voted.
JoEditor's picture
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JoEditor 14 October, 2016 - 12:38

Hi Emmobe,
Thanks for your comment. We have a problem with this game and a few others and we're trying to fix them. The Magic Gopher should be back soon! Sorry about this! 
Best wishes, Jo (LearnEnglish Teens Team) 

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84 users have voted.
talga_crut's picture
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talga_crut 15 September, 2016 - 02:17

What would you have two-digit number you do not put forth - after subtraction of the two components can only get numbers of 81, 72, 63, 54, 45, 36, 27, 18 or 9. Look - in the symbol table, all symbols corresponding to these numbers - the same. Naturally, the square provides exactly what you "put forth"
And that did not raise suspicions, the picture is constantly changing.
That's the whole secret.

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111 users have voted.
Jo - Coordinator's picture
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Jo - Coordinator 12 August, 2016 - 10:39

Hi gore_ross, You're right, it doesn't work on a phone, I'm sorry. We're working to make all of our site mobile friendly in the near future. Best wishes, Joanna (LearnEnglish Teens team)

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104 users have voted.
kaboooom's picture
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kaboooom 17 June, 2016 - 05:01

Now let me explain you the reason. The number is 2 dight, so it should be (10a+b). Follow his instructions, it will end up as 9a. now you wold mention the mutiply of 9's sign is all the same.

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131 users have voted.

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