How to Do a Calculator Trick

Calculator tricks are simple mathematical formulas, but to the people watching they look like magic. You can perform these feats almost anywhere since the only prop you need is a calculator.

Difficulty: Easy

Instructions

1. Ask someone to choose a number between 1 and 9. Give him a calculator and ask him to multiply the chosen number by 9. Then have them multiply the result by 12,345,679.

2. Guess their mystery number by looking at the final number on the calculator. If the calculator reads 333,333 then the original number they entered was 3.

3. Call someone the phone and announce that you can predict if they will have good luck of bad luck in their future. Ask them to choose a three digit number and enter it into a calculator twice, for example if they choose 457 they would enter 457,457.

4. Ask the subject to concentrate on the display to make this trick work. Tell him that the number is divisible by 11, and have him verify by dividing the number by 11.

5. Announce that the number now appearing on the calculator display is divisible by 13, have him verify by dividing it by 13. Ask him to divide the final answer by his original 3 digit number and the new number will determine fortune, the answer will be a 7 meaning good luck.

6. Try predicting bad luck with someone else Have him divide by 7 in Step 6 instead of 13 and the final answer will be 13 symbolizing bad luck