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20cm *10cm = 0.2m *0.1m = 0.02 sq metres.
10/100 which simplifies to 1/10
if a decimeter equals 10cm and a meter is 100cm then a square meter is 100X100 which is 10 000 so 10 000 divided by 10 is 1000 thus there are 1000 decimeters in a square meter
A decimeter (dm) is 10cm, or 1/10th of a meter, so 3.8 meters is 38dm.
one thousandth of a meter can be written various ways:1mm=.10cm=.01dm=.001M