Phone Number Math

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Big Media
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Phone Number Math

Post by Big Media »

Would one of you smart asses that frequent this board explain to me how this works? I mean smart asses in the nicest way. :)




Math Trick Phone Number
Here is a math trick so unbelievable that it will stump you. Personally I
would like to know who came up with this and why that person is not running
the country.

1. Grab a calculator. (you won't be able to do this one in your
head)

2. Key in the first three digits of your phone number (NOT the area
code)

3. Multiply by 80

4. Add 1

5. Multiply by 250

6. Add the last 4 digits of your phone number

7. Add the last 4 digits of your phone number again.

8. Subtract 250

9. Divide number by 2

Do you recognize the answer ??????
nuggie99
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Post by nuggie99 »

First 3 numbers = X, last 4 numbers = Y

X*80
X*80 +1
X * 20000 + 250
X * 20000 + 250 + Y
X * 20000 + 250 + 2Y
X * 20000 + 250 - 250 + 2Y = X * 20000 + 2Y
X * 10000 + Y

so if X = 867 and Y = 5309 then X * 10000 + Y = 8675309

I might have skipped a step, but it's simple math.
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Hoosier Daddy
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Post by Hoosier Daddy »

My head hurts. I hate Algebra.

:(
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AmpedNow
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Post by AmpedNow »

No.


:lol:
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Arp2
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Re: Phone Number Math

Post by Arp2 »

Big Media wrote:2. Key in the first three digits of your phone number (NOT the area code)

3. Multiply by 80

4. Add 1

5. Multiply by 250

6. Add the last 4 digits of your phone number

7. Add the last 4 digits of your phone number again.

8. Subtract 250

9. Divide number by 2

Do you recognize the answer ??????
Essentially, you're multiplying your prefix by 10,000 and then adding your last four digits.

Steps 2 and 3 make your prefix into the first three digits in what will be a seven-digit number once you do steps 5 and 9.

Steps 2 and 3 make the singles column "0," making the effect of steps 4 and 5 irrelevant once you hit step 8; step 4 just makes it harder to see what's coming and could be left out if step 8 were left out, too.

Step 6 makes your last four digits match your phone number while step 7 serves to make the effect of step 9 irrelevant to those last four digits.
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Post by The People's DJ »

Image

Math is hard.
CoolBreeze
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Post by CoolBreeze »

Isn't the "age" game based on the same basic math? (and probably several other games)
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