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Numerical Reverser

Part 1: Two Digit Reversal

Here's a cool trick you can do in your head. You can mystify most of your friends relatively easily this way!

  1. Pick any two-digit number. For example, 57.
  2. Reverse the digits. For example, 75.
  3. Add your original number. For example, 75 + 57 = 132.
  4. From the menu, select the last digit of your total. Then check the total number of digits. For example, if your total was 132, you would select "Last Digit is 2" and click "3 Digits."

2 Digits
3 Digits



How does it work?