• Getting rid of zeros helps with big 100,000,000 and small 0.000,000,001 numbers.
1,000,000. can be rewritten as
1. × 106 with the 6 saying the decimal has moved 6 steps left.
0.001 can be rewritten as
1. × 10-3 with the -3 saying the decimal has moved 3 steps right.
1. × 100 is just 1., since 0 means the decimal hasn't been moved.