UNBELIEVABLE MATH PROBLEM

[SMAN]

Here is a math trick so unbelievable that it will stump you.

Personally I would like to know how it works.

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

2. Key in the first three digits of your phone number (NOT the area code)

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

Do you recognize the answer?

[bevin]

Actually I can do it in my head...

((xyz * 80 + 1) * 250 + xyz + xyz - 250) / 2 =

( xyz * 20000 + 2 * xyz ) / 2 =

xyz * 10000 + xyz =

xyz0xyz

[cricket]

I used paper and pencil...

((xyz * 80 + 1) * 250 + abcd + abcd - 250) / 2 =

(250(80xyz + 1) +2abcd - 250)/2 =

(20000xyx + 250 + 2abcd - 250)/2 =

10000xyz + abcd =

xyzabcd

[Aliensanctuary]

Bravo, Chrysket, you get the A, plus no homework for a week.

Please pass your pencil and paper to Bevin.

[Amelia]

Ok I still dont understand how it does that. I can see that you have shown how its done but not how the how its done. I hate math and this is creepy.

[cricket]

The first three digits are multiplied by 10000. If your first three digits were, say, 669. Then, in the final "solution" it would be represented as 6,690,000. Then you add the last four digits (you're only adding them once because you've already divided by 2).

You can do this math!!