520

Alright. I haven't posted in a while. But I'm bored right now. So, I saw this little number trick and I decided to dissect it. Why? I don't know.

1. Start with the first three digits of your phone number. (Do not use the area code.)
2. Multiply that number by 80.
3. Add 1.
4. Multiply by 250.
5. Add the last four digits of your phone number.
6. Add the last four digits of your phone number again.
7. Subtract 250.
8. Divide number by 2.

Why does this work? Let me show you the formula. X = the first three digits and Y = the last four digits.

[Base]
(250 (80 * x + 1) - 250 + 2y) / 2

[Distribute 250]
= (250 * 80 * x) + (250 * 1) - 250 + 2y) / 2

[250 * 1 = 250]
= (80 * 250 * x) + 250 - 250 + 2y) / 2

[250 - 250 = 0]
= (80 * (250 * x + 2 * y)) / 2

[Divide both terms by 2]
= 40 * (250 * x) + y

[40 * 250 = 10000]
= (10000 * x) + y

Not so clever now, is it?

Song of the Moment: Nine Inch Nails - The Line Begins To Blur