1. Think of your age (or any number greater than 9). | Let's think of 136. |
2. Multiply by 10. | Then we get 1360. |
3. Now pick a number less than or equal to 9. | Let's pick 3. |
4. Multiply it by 9. | Now we get 27. |
5. Subtract the two results (step 2 and step 4). | We get 1360 - 27 = 1333. |
6. Ask for the answer. | We are told 1333, so add the units digit (3) to the rest of the number (133) to obtain 136 (the original number). |