Colorado State University
Metric Numbers to Remember
Look to this site for many important numbers and conversion factors used between the metric system and the customary system, such as speed of light, body temperature, distance from sun to earth, plus more.
Math Is Fun
Math Is Fun: Metric Numbers
The system of metric numbers is explained with numbers from the infinitesimally small to unfathomably large. Charts listing the numbers by powers of ten make the system easier to understand.