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Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Metric Olympic Games (Intermediate)
This activity can be used to introduce the metric system to students.
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.
National Institute of Standards and Technology (NIST)
Nist: Rules & Style Conventions for International System of Units (Si)
The official rules for using the SI (metric) system in the US, based on the National Institute of Standards. Must download their handbook.