20 mm should still be 20 mm!
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show me 21 mm on ruler
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.
With considerable difficulty! With a 30 cm ruler you can easily ascertain that the length is between 2 and 3 ruler-lengths: 600 mm and 900 mm. Maybe you can judge that the the remainder, after 600 mm is less than half of the 30 cm ruler. So that tells you that it is between 600 mm and 750 mm.
a ruler measures 15 cm .1 cm =10 mm .THis means , 1 standard ruler measures 150 mm.
A metric ruler is use to measure centimeter and millimeters.1 centimeter (cm) = 10 millimeters (mm) .