LESSON: Prefixes used with SI Units

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Prefixes

As mentioned earlier, the SI system is a decimal system.  Prefixes are used to change SI units by powers of ten.  Thus, one hundredth of a meter is a centimeter and one thousandth of a gram is a milligram.  The metric units for all quantities use the same prefixes.  One thousand meters is a kilometer and one thousand grams is a kilogram.  The common prefixes are shown in the table below.

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