A Little Mind Reading Trick

1.   Get a friend to write down any three digit number, but all the numbers must be different.  Tell them not to let you see what they write.
2.   Write the number again backwards.
3.   Minus the small number from the big number.
4.   Ask him/her what the first digit of the final answer is.
5.   If the first digit is a ... 1 - then the final answer they have is 198, 2 - then their final answers is 297, 3 - 396, 4 - 495, 5 - 594, 6 - 693, 7 - 792, 8 - 891, 9 - 99. e.g. 123 > 321, 321-123=198.   198 begins with a ` so their answer must be 198!

TIP: If the first number is 1-8, the second number is always 9.  The first and last number's sum is always 9.
e.g. 198 1+8=9

Amaze your friends!

discovered by Lucia