Results of Sum Revealed Same as Number Written Down before

Author:
Lew W. S.

Instructions for the Number Guessing Game

This game is played with at least 2 persons. One person (you) is the one who knows the secret. The other(s) will write some 4 digit numbers between 1000 and 9999. The highlight of the trick is your ability to have predicted/guessed the total sum before even all the numbers are written down! Sequence of action. 1. First one of your friends will write down the first 4 digit number say 6357 on a paper 2. Next you write a number on another piece of paper and fold it up and do not reveal it to the rest. 3. Then your friend(s) will write down the next 4 digit number for all to see. Say 3231 as in the video 4. After this, you write down the next 4 digit number on the paper, 6768 as in the video. 5. Again your friend(s) will write down their third number after you, e.g. 4620. 6. Finally you write down the last number, say 5379. 7. Now sum up all the numbers. 8. Reveal what you have written in step 2, and everyone is shocked that it is the same number in step 7, which is the sum of all the numbers in step 1, and 3 to 6. What is the secret to this number trick?