That's How You Can Confuse Your Math Teacher

Bright Side is going to teach you a mathematical trick which requires no special preparation. This trick will confuse your math teacher and impress your friends. You’re going to fall in love with math after this even if you haven't been a fan of it before.
TIMESTAMPS
The art of Math 0:58
The trick 2:13
The trick explained 5:46
Music:
SUMMARY
-Albert Einstein said that “Pure mathematics is, in its way, the poetry of logical ideas.” In Math, 2 plus 2 always equals 4. Or does it?
-Be amazed as you see magic happening in front of you. You’ll see how a number picked at random turns into a number previously saved in a secret folder.
-Pick any five-digit number. You take your secret five-digit number and lose the first digit, then add 2 to the last digit. Now ask one of your friends or even your teacher to give you any number. Next, your task is to name a number, which will give 9999 if you add it to the previous number. Then, again, it is your friends’ turn to pick the four digits.
Once again, you name the next number. Remember it has to give us 9999 in the end.
Now let us put all the numbers together. There you go – we’ve got the number it all started with.
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