10 centimeters equal 1 decimeter.
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A decimetre.
There are 20 millimeters in 2 centimeters because if there are 10 millimeters in 1 centimeter and this metric system is based on 10 then if you count 10 times 10 it equals 20.
100 millimeters, 1 decimeter, 0.1 meter, 0.0001 kilometers, etc.
There are 10 metric quintals in one metric ton. There are other measurements labeled "ton", and others labeled "quintal", but these are the most common.
Metric measurements use powers of 10. Any other system has NO bases or logic.