Demonstrates the 1089 number trick for a 3 digit number that you enter

This calculator has 1 input.

This calculator has 1 input.

- Take a 3 digit number and call this a
- Reverse the digits and call this b
- Take the maximum of a and b and subtract the minimum of a and b
- Reverse the digits of this number
- Add the numbers together in Steps 3 and 4

For more math formulas, check out our Formula Dossier

- 1089 number trick
- Take a 3 digit number. Subtract the palindrome of the 3 digit number. Take the result. Add this result to the palindrome of the result. The answer is 1089
- algorithm
- A process to solve a problem in a set amount of time
- number
- an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.