[Grab a calculator - you won't be able to do this one in your head…]

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 have is your phone number…

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Not sure, eh?  Prove it with this Phone Math Trick Excel Spreadsheet ...