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The millimeters on a ruler are the tiny lines in between each centimeter
a mm
It depends. If it is a metric ruler then they are most likely to be millimetres. On an Imperial ruler the smallest may be sixteenths of an inch.
You will not find 21.91 cm on a ruler. The metric side of te ruler is usually graduated in centimetres, with each centimetre divided into 10. So the nearest you will get is 21.9 cm.
you take a ruler and you measure each side and you multiply each numbers of each side