My teacher's birthday math trick...how the h**l does she do it?!?!?!?

Question

Alright, my teacher uses 5 pieces of paper. Each paper contains numbers on them, quite a few random numbers. She told me to look at the five papers and out of like 2 of them my birthday number was in them. after she eliminated like about 3 papers and I told her my day was in the papers. She got it right. for example im born may 10th, she just told me i was born on the 10th. i was wondering how she did that...

Answer 1

IDK MY BFF JILL?

Answer 2

ahhhh the good old birthday math trick strikes again

Answer 3

those are special cards

she calculates the top left corner number or something like that i have cards llike that

Answer 4

Your file?

Answer 5

well teachers do have all your information such as birthdays, middle names, allergies, parent info, phone numbers.  

Answer 6

She has a file on you with your birthday.

Lol?

Answer 7

no clue but i wish i had them skills

Answer 8

I'll give you a short answer and a long answer.

The short answer is that the numbers are not written on the cards randomly, but in a very specific pattern, so that someone who knows the trick can immediately tell you when your birthday is from the cards that have your birthday written on them. But you probably already guessed that much.

The long answer requires you to know a bit about binary numbers. Binary numbers use just two digits, 0 and 1. Like computers. In decimal numbers you write the number 425, and you know from the position of the numbers that it is 4 hundred plus 2 times 10 plus 5. Each position further to the left is ten times greater.

In binary numbers it's the same way, except you start with 1, and each position further to the left is just two times greater. So the number 11011 is 1 plus 1 times two plus 0 times four plus 1 time 8 plus 1 times 16.

So the numbers from 1 through 31 can be represented with five binary digits, because 31 equals 1 + 2 + 4 + 8 + 16, or 11111.

So you take your five pieces of paper, and you write on the first one all of the numbers from 1 through 31 that require ----1 in binary. (This happens to be all odd numbers from 1 through 31.) On the second paper you write all of the numbers that require ---1- in binary (2, 3, 6, 7, 10, and so on). Continue like that for all five pieces of paper.

If you want to be tricky, mix up the numbers on each piece of paper so that people can't spot a pattern. (This might make them look random, even though they're not.)

Your birthday, the 10th, is 2 plus 8, or 01010 in binary, so it would appear on the second and the fourth piece of paper, but not on any of the other three. All you teacher now has to do is convert 01010 to decimal: 2 + 8 = 10.

Answer 9

i was able to do that once but i forgot how it works. its something about the cards, and how there ordered and everything, i saw it in a book, i could look for it for you.

Answer 10

She's ur teacher! Lol she knows ur school ID #, ur address, ur BIRTHDAY..Lol she has access to that since u are her student...

Thats my guess.. and my cousin has that birthday too

MAY 10, WOOT WOOT

Lol =P

Answer 11

the cards don't have "random" numbers.  she looked to see what number was on the two cards you gave her and not on the other cards.  that's how she knew.