Using the Metric System and Scientific Notation for Conversions

This video explains the logic behind how the metric system chart and scientific notation are used. It was always confusing to me and something intro-level college biology and chemistry classes require you to know.
Watching Guide
0:00 Intro
1:04 1 Km converted to m
2:52 100 cm converted to m
4:31 2.54 x 10^-25 km converted to nanometers