This is what my friends and I currently obsessed with..
How do these people know how to work this out?
1. Key-in the first 3 digit of your hand phone number(not the 01x no.) into the calculator
2. Multiply by 80
3. Add 1
4. Multiply by 250
5. Plus last four digit of phone number
6. Plus last four digit of phone number again
7. Minus 250
8. Divide by 2
Is it your hand phone number?
This had made all of us wondering the whole day..how did it could happen?