10 x 10 = 100 = 102
10 x 10 x 10 = 1,000 = 103
10 x 10 x 10 x 10 x 10 x 10 = 1,000,000 = 106
300,000 = 3 x 105
5,000,000,000 = 5 x 109
1/10 x 1/10 = 1/100 = 10-2
1/1,000,000 = 10-6