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A Math Trick

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 to this the last 4 digits of your phone number
6. Add to this the last 4 digits of your phone number again.
7. Subtract 250
8. Divide number by 2

Do you recognize the answer ?

Comments

( 8 comments — Leave a comment )
papaya
Oct. 13th, 2010 11:19 pm (UTC)
No...maybe I did it wrong? When you say add it to the last four digits of my phone number, do you mean add whatever the number is to the numbers, or tack it to the end of my phone number?
avecvu
Oct. 14th, 2010 12:35 am (UTC)
If my phone number is 555-1234:

555 x
80 =
44400 +
1 =
44401 x
250 =
11,100,250 +
1234 =
11, 101, 385 +
1234 =
11, 102, 718 -
250 =
11, 102, 468 /
2 =
555, 1234

I think you misread steps 4 and 5?
papaya
Oct. 14th, 2010 12:39 am (UTC)
I missed the last step. Oops.
avecvu
Oct. 14th, 2010 12:52 am (UTC)
I initially just typed all the numbers into google so they'd do the math all at once, and I got some weird number and was like, "sharya is crazy."

Google groups it like this though: (555 x 80) + (1 x 250) + 1 234 + 1 234 - (250 / 2) = 46 993

Computers, man. Useless.
joeymichaels
Oct. 13th, 2010 11:37 pm (UTC)
Math rocks.
phaedie
Oct. 13th, 2010 11:59 pm (UTC)
Magic math witch. ;P
murun
Oct. 14th, 2010 06:18 am (UTC)
Our phone number has 6 digits here in England. :(
egbert
Oct. 14th, 2010 03:19 pm (UTC)
((80 * X + 1) * 250 + Y + Y - 250) / 2

expanded:

(250 * 80 * X + 250 + 2 * Y - 250) / 2

The 250s cancel each other, and expanding out 80 * 250:

(20000 * X + 2 * Y) / 2

reduced:

10000 * X + Y

And there you go, easy enough.

( 8 comments — Leave a comment )

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