WonDerMaTh..

1. Key-in the first 3 digit of your handphone number (not the 01x number) 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 handphone number???