## Pseudocode

```
1. num := number to multiply by 11
2. sum := sum of first and second digits of num
3. if sum < 9:
4. insert sum between first and second digits of num
5. else:
6. insert second digit of sum between first and second digits of num
7. add 1 to first digit of num
```

## Examples

- 42 * 11:
- sum = 4 + 2 = 6
- product = 462

- 99 * 11:
- sum = 9 + 9 = 18
- product = 1089