One decimetre is equal to 10 centimetres. Therefore, there are three decimetres on a normal 30 centimetre ruler.
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A decimeter is a unit of length in the metric system, equivalent to one-tenth of a meter. On a standard ruler with centimeter and millimeter markings, the decimeter would typically be represented by the centimeter markings. Therefore, each decimeter would be equal to 10 centimeters on the ruler.
12 inches=3.04800 decimeters
You would use to measure decimeter is a ruler.
a slice of bread, a mobile phone
a decimeter is longer