Mnemonic Device:
 Kids Hate Doing Math During Cloudy Mondays
Explanation: to remember the units of measurement in the metric system.

Km Hm Dam M Dm Cm Mm
 Kilometer Hectometer Dekameter Meter Decimeter Centimeter Millimeter
Additional Note: it also helps when converting (e.g., meters to millimeters), count how many spaces there are from meters to millimeters to know where to place the decimal.
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