We have three numbers given in scientific notation:
We need to convert it to decimal:
The negative power means that we need to move the decimal point to the left.
6.5x10^-4 = 0.00065
5.2x10^-3 = 0.0052
8.1x10^-5 = 0.000081
Now, we can order least to greater.
1. 0.0052
2. 0.00065
3. 0.000081