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aslan
Aslan  (Level: 27.6 - Posts: 356)
Wed, 18th Apr '07 9:51 PM

UNBELIEVABLE MATH PROBLEM

UNBELIEVABLE MATH PROBLEM

Here is a math trick so unbelievable that it will stump you. I would like to know who came up with this and why it works.

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 ??

oogie54
Oogie54  (Level: 201.2 - Posts: 1120)
Wed, 18th Apr '07 9:55 PM

That's Kewl!

lisap369
Lisap369  (Level: 61.1 - Posts: 992)
Wed, 18th Apr '07 10:03 PM

Way Kewl!! Any ideas on why it works? (def not a math mind here)

smoke20
Smoke20  (Level: 62.6 - Posts: 2815)
Wed, 18th Apr '07 10:25 PM

I've seen it before and had it explained to me but for the life of me can't remember anything about the explanation. Words are my thing, numbers are SO not!

asdibbens
Asdibbens  (Level: 159.4 - Posts: 423)
Wed, 18th Apr '07 10:39 PM

I have seen this before, but whether it was here, in e-mail or on another website I can't remember. Anyway, by breaking down what you are actually doing to the numbers, you can fairly easily figure it out.

---

2. Key in the first three digits of your phone number (NOT the Area code) - Here you are entering part of phone number, but it is in the wrong position. To get into the correct position you need to multiply these numbers by 10,000.
3. Multiply by 80 - part way getting you to the multiplication needed to get the first three numbers into position.
4. Add 1 - this is a smoke and mirrors distractor portion of the steps
5. Multiply by 250 - you have now multiplied the first 3 digits of your phone numbe by 20,000 - except you are 250 over because you added an extra 1 and then multiplied it 250 times.
6. Add the last 4 digits of your phone number - working now on your last four digits
7. Add the last 4 digits of your phone number again. - doubling your last four digits
8. Subtract 250 - getting rid of that extra 250
9. Divide number by 2 - cutting the number to reveal your phone number


kaufman
Kaufman  (Level: 256.8 - Posts: 3936)
Wed, 18th Apr '07 10:40 PM

Let's step through.

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)
Okay. You have the first three digits.
3. Multiply by 80
80 times the first three.
4. Add 1
80 times the first three plus 1
5. Multiply by 250
20,000 times the first three plus 250
6. Add the last 4 digits of your phone number
20,000 times the first 3 plus 250 plus the last four
7. Add the last 4 digits of your phone number again.
20,000 times the first 3 plus 250 plus double the last four
8. Subtract 250
20,000 times the first 3 plus double the last four, which is the same as double
your phone number
9. Divide number by 2
By definition. No trick involved. Just a few things thrown in to confuse it.

asdibbens
Asdibbens  (Level: 159.4 - Posts: 423)
Wed, 18th Apr '07 10:46 PM

Uh oh, did we just label ourselves math nerds?

smoke20
Smoke20  (Level: 62.6 - Posts: 2815)
Wed, 18th Apr '07 10:51 PM

Allow me to reveal the depth of my math darkness. I don't understand the explanation.

asdibbens
Asdibbens  (Level: 159.4 - Posts: 423)
Wed, 18th Apr '07 11:08 PM

Maybe going through with some actual phone numbers will make it make more sense.

Let's say my phone number was 123-4567

2. Key in the first three digits of your phone number (NOT the Area code) - 123 (to get the 123 into the correct position in the phone number there should be 4 zeros after it which I can get by multiplying by 10,000)

3. Multiply by 80 - 9840 (I'm part way there moving the numbers to where they need to be, but this is a step really designed to confuse you as to what is going on)
4. Add 1 - 9841 (completely unnecessary, just a part of the equation to make it look more like a trick)
5. Multiply by 250 - 2460250 (notice how the 246 is double the original 123, but now they have four numbers behind them)
6. Add the last 4 digits of your phone number - 2464817
7. Add the last 4 digits of your phone number again. - 2469384 (I'm at double my whole phone number, except I'm 250 over)
8. Subtract 250 - 2469134 (extra 250 taken care of)
9. Divide number by 2 - 1234567 (Voila)




smoke20
Smoke20  (Level: 62.6 - Posts: 2815)
Wed, 18th Apr '07 11:12 PM

So essentially you're doing an operation to your chosen number (multiplication), then undoing it (division), and throwing in a few random digits and taking them out again as a diversion?

asdibbens
Asdibbens  (Level: 159.4 - Posts: 423)
Wed, 18th Apr '07 11:20 PM

Yep!

kaufman
Kaufman  (Level: 256.8 - Posts: 3936)
Wed, 18th Apr '07 11:32 PM

No, we didn't just label ourselves. It's old news

(Though I prefer the more politically correct "colossal math geeks")

bigbird
Bigbird  (Level: 239.4 - Posts: 3300)
Thu, 19th Apr '07 6:10 AM

What a bunch of killjoys! I would much prefer to believe it is magic.

Alice


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