Math is nuts
malty:UNBELIEVABLE MATH PROBLEM
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.
Grab a calculator. (you won’t be able to do this one in your Head)
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 2I love these kinds of things. This is better than spelling Boobs upside down. (via amyyy)
That is some crazy shit. ::chuckles like Beavis at bg5000::
Okay, I’m going to do some crazy stuff too… geeky stuff right now.
I’ve seen this done in simpler form (start with x, end with crazy number that has some relation to the original). This was neat, so without further ado, I present the reason why this works out for phone numbers.
The key to making this work is the power of 10. Drew Carey wants us to take the first number, which we’ll call x, multiply it by a power of 10, and then add to that the second number, which we’ll call y. You can adjust the steps so that you can pair numbers of any length, not just 3 and 4 digit pairs.
Here are the steps:
- Start with x
- 80x
- 80x + 1
- 250 (80x + 1)… expand this to get 20,000x + 250
- 20,000x + 250 + y
- 20,000x + 250 + y + y = 20,000x + 2y + 250
- Gotta get rid of that messy 250, so subtract and get 20,000x + 2y
- Still too messy, divide by 2: 10,000x + y
So let’s say x = 123. Multiplying it by 10,000 makes it a seven digit number, leaving four spaces for the final four digits of y that you plan to add. So 123 becomes 123-0000, add whatever you want for y and you’re done! So basically, all those middle steps can be reduced to one or two big steps, but since the math geeks like to play magician, we make it complicated. :)
EDIT: and after seeing the reblogs, I realized that someone already made my point in fewer words. blah.
