You should know about the following common metric units of measurement:
Length and Distance
1 km = 1,000 m
1 m = 100 cm = 1,000 mm
1 cm = 10 mm
Mass
1 kg = 1,000 g
Capacity
1 litre = 1,000 ml
These are really important conversions to know, so spend a bit of time learning them.
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