Activities to learn about imperial and metric measures.

For the majority of recorded human history, units like the weight of a grain or the length of a hand weren't exact and varied from place to place. Now, consistent measurements are such an integral part of our daily lives that it's hard...

Based on a Calfornia ordinance that limits the size of lawns, Habitat Network offers some alternatives for a species-rich backyard.

The official rules for using the SI (metric) system in the US, based on the National Institute of Standards. Must download their handbook.

On this interactive site students learn to use various units of mass to solve problems and put objects in order by their mass.

By the end of this section, you will be able to do the following: Perform unit conversions in both SI and English units, Explain the most common prefixes of SI units, and be able to write them in scientific notation.