To order the decimals from least to greatest, let's compare them:
- 1.09
- 1.9
- 1.92
This set is in the correct order: 1.09, 1.9, 1.92
Now, let's check the other sets:
-
1.9, 1.09, 1.009 - This is incorrect because 1.009 is less than both 1.09 and 1.9.
-
1.9, 1.091, 1.09 - This is incorrect because 1.09 is less than both 1.091 and 1.9.
-
1.99, 1.9, 1.09 - This is also incorrect, as 1.09 is less than both 1.9 and 1.99.
Thus, the correct choice is:
1.09, 1.9, 1.92