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The metric system, based on powers of ten, uses prefixes to describe measurements of all sizes. This video introduces students to the metric system’s prefixes and some of the more common bases. The mnemonic “King Henry Died Drinking Chocolate Milk” gives students a funny, memorable way to keep the prefixes straight. The song includes an explanation of the following prefixes: kilo, hecto, deca, deci, centi, and milli.