Approximately '4 inches'.
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a ruler measures 15 cm .1 cm =10 mm .THis means , 1 standard ruler measures 150 mm.
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.
Where is .13m on a cm ruler?
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.
use a ruler