To order the numbers from least to greatest, we'll first compare the tenths place of each number.
The number 3.45 has a tenths place of 4.
Since there's only one number given (3.45), there isn't a comparison with other numbers. Thus, we cannot determine a smallest number with only this single value. If you provide more numbers, I can help you compare and order them!
For the current information:
Smallest number: [3.45]