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From o1-mini:

To determine which number is larger between 9.11 and 9.9, let's compare them step by step:

Understanding the Numbers: 9.11 can be read as "nine and eleven hundredths." 9.9 can be read as "nine and nine tenths." To make the comparison easier, you can also think of it as 9.90 (adding a zero doesn't change the value).

Comparing the Decimal Places: Ones Place: Both numbers have 9 in the ones place. Tenths Place: 9.11 has a 1 in the tenths place. 9.90 has a 9 in the tenths place.

Conclusion: Since 9.90 has a larger value in the tenths place compared to 9.11, 9.90 (or 9.9) is larger than 9.11. Therefore, 9.9 is larger than 9.11.



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