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.

433
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Discussion

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

Comments

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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15 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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45 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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61 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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100 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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71 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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97 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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90 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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117 users have voted.
DanielDane's picture
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DanielDane 18 July, 2016 - 13:31

Simple! I dont know how but the game knows at what symbol you are looking at,and it can guess it.Try to do a random number,remember the symbol and try it again with the same number,look at another symbol and it wont guess the correct symbol!
Sorry for my bad English

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106 users have voted.
cupcakeID123's picture
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cupcakeID123 2 August, 2016 - 15:24

Sorry danieldane but i tried that and he can guess your number simply because every answer you have is a multiple of 9,if you look at the symbol page all multiples of 9 (other than 90) HAVE THE same symbol!!

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91 users have voted.

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