Quote:

Originally Posted by **StrangeCheez** Grab a calculator. (you won't be able to do this one in your Head)
1. Key in the first three digits of your 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
Do you recognize the answer ?? |

if your phone number is abcdefg for some digits {a,b,c,d,e,f,g}, the equation comes out to:

(((80*abc + 1)*250)+2*defg-250)/2

= (80*250*abc + 250 +2*defg-250)/2

= (20000*abc +2*defg)/2

= 10000*abc + defg

= abc * 10^4 + defg

= abc0000 + defg

= abcdefg

= your phone number

There's nothing interesting about this. A gradeschooler could invent the steps to get this result, as it's all based on (80 *250)/2 = 10000.