For this case we have the following numbers: 3.1 × 10-2 2.01 × 10-3 4.2 × 10-5 1.03 × 10-1 2.32 × 10-4 To order the numbers, we must look at the exponent. The greater the exponent, the greater the number. We have then that the order of greatest to least is: 1.03 × 10-1 3.1 × 10-2 2.01 × 10-3 2.32 × 10-4 4.2 × 10-5