Amazing and unbelievable Mathematical Trick

One more Number Game

A math trick so unbelievable that it will stump you. Personally I would like to know who came up with this. It is pretty amazing.

1. Grab a calculator. (you won't be able to do this one in your head)

2. Take in the first three digits of your land line telephone number (NOT the area code) (For 8 digit Tel. Nos. - take in the first four digits of your phone number).

3. Multiply by 80.

4. Add 1.

5. Multiply by 250.

6. Add the last 4 digits of your phone number.

7. Add the last 4 digits of your phone number again.

8. Subtract 250.

9. Divide number by 2.

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Do you recognize the answer?...............