Metric system

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A repeating slide show of images at different magnifications from the scale of the universe to the scale of nucleons.

This website is great because it generates numbers for students to guess how many sig figs each number has.

A collection of online calculators for various metric conversions.

A well-organized table with the prefixes, symbols, names and numbers from one septillion to one septillionth!

This site helps students understand how to measure the volume. Great visuals.

Tables of SI base and derived units, metric prefixes. This page includes a diagram of how the base and derived SI units relate to each other.