# Always End With 1089

### Add two numbers together and always end with 1089.

Here is How:

Pick a three digit number.

**The three digits used must be different***. i.e. 123Reverse that number. 123 becomes 321

Take the smallest three digit number from the largest.

321 − 123 = 198

321 − 123 = 198

Take the answer and reverse that number. 198 becomes 891

Add that number to the answer of the subtraction.

891 + 198 = 1089

891 + 198 = 1089

### The answer will be 1089

#### So why does it do this?

Find out here

### Footnotes

* But I ended with **198** not **1089** ... !

This happens if you pick a number like 546.

546 goes like this: 645−546=99, then 99+99=198.

BUT if you assume that **099 is a 3 digit number**, you will get:

990−099=891, and 891+198=1089

* If you don't pick three different digits then this might happen:

343−343=0, 0+0=0