A metric ruler is use to measure centimeter and millimeters.
1 centimeter (cm) = 10 millimeters (mm) .
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a ruler measures 15 cm .1 cm =10 mm .THis means , 1 standard ruler measures 150 mm.
The normal size of a ruler should be 12 inches or 30cm. (30 cm=300 mm) (1 in=25 mm)
1 cm = 10 mm. Start with ruler at 0 and mark ribbon at 30 cm. Then place ruler at the mark and measure 30 cm more and make another mark- you are up to 60 cm or 600 mm. Then place ruler at this mark and measure 5 cm, or 50 mm. Now you have a 650 mm ribbon.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.
20 mm should still be 20 mm!