9.9 is larger than 9.11.

To compare these decimal numbers, I can align them by decimal places:
- 9.9 = 9.90
- 9.11 = 9.11

Comparing digit by digit from left to right:
- The ones place is the same (9)
- In the tenths place: 9 > 1

Therefore, 9.9 (or 9.90) is greater than 9.11.
