1. Write a number on a piece of paper equal to the current year times two. (example: 1999 x 2 =3998).

2. Fold the paper and put it in your pocket.

3. Give your friend a piece of paper and a pencil.

4. Tell your friend to write down the following:

A. The year he was born

B. The year he started school

C. How old he will be at the end of this year

D. The number of years he has been in school by the end of this year.

Make sure he doesn' t tell you any of these numbers!

5. Tell your friend to add up all of his numbers.

6. Now, take out the piece of paper in your pocket and amaze your friend by showing him the same number he just wrote!

If you are using this trick for your parents, or someone finished with school, you will have to change the questions to the following:

A. The year he was born

B. The year he graduated high school

C. How old he will be at the end of this year

D. The number of years since graduation, by the end of this year.