Question

Order the following numbers from least to greatest: 3.9 x 10^15, 7.3 x 10^9, 4.6 x 10^9, 2.1 x 10^18

Answer 1

1. 7.3 x 10^9

2. 3.9 x 20^15

3. 2.1 x 10^18

Explanation

Multiplying by exponents of 10 you simply move the decimals that many places.