**9.9** is larger than 9.11.

Here's why:

When comparing decimals, start from the left and compare the digits in each place value.

1.  **The ones place:** Both numbers have a **9**, so they are equal so far.
2.  **The tenths place (the first digit after the decimal):**
    *   9.11 has a **1**.
    *   9.9 has a **9**.

Since 9 is greater than 1, **9.9** is the larger number.

You can also think of it by adding a zero to 9.9 to make it 9.90. It's easier to see that 9.90 is larger than 9.11.
