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This website is great because it generates numbers for students to guess how many sig figs each number has.
Significant Figures
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A repeating slide show of images at different magnifications from the scale of the universe to the scale of nucleons.
Science, Optics and You
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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.
US Metric Association
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