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Have Fun With Numbers - Telephone Trick

[You may need to use a calculator - you might not be able to do this one in your head…]

This only works if you have a 7-digit phone number.

1. Key in the first three digits of your 7-digit phone number (NOT the area code);
2. Multiply by 80;
3. Add 1;
4. Multiply by 250;
5. Add the last 4 digits of your phone number;
6. Add the last 4 digits of your phone number again;
7. Subtract 250;
8. Divide number by 2.

What you should have now is your actual phone number.


  1. Englishlearner20043:43 pm

    Wow, I was searching this for a long time lol Actually someone tricked me about this and she was not telling me the trick how she did and I got it now!! Thanks!


  2. Englishlearner20043:40 pm

    OOPs I checked the number but something is wrong, I am sure I didn;t do the mis-calculation.

  3. You do need a 7 digit phone number for it to work.

  4. Anonymous8:58 am

    really its very good idea to make trickes

  5. nice one... m replicating it on my blog too.. :)

  6. you can do it with 8 digits too for example, but then you'll have to adjust the instructions, like multiply the first 3 by 800 and add the last 5 digits twice or something. or in the original you can multiply by 120 in the first step, then add the last 4 three times and divide by 3 :) anyway, a very neat trick, I like it :)


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