A decimeter is a unit of length in the metric system. The term “Deci” means onetenth, and therefore decimetre means onetenth of a meter. Since a meter is made up of 100 cm, onetenth of 100 cm is 10 cm. Thus one decimeter measures 10 cm.
The symbol used to write decimeter is dm.
Scale showing 1 meter divided into 10 parts. Each part measures 1 decimeter.
Few conversions for decimeter are as follows:
1 dm = 10 cm
1 dm = 100 mm
1 dm = 0.1 m
The type of problems for decimeter shall mostly involve the conversion of units. Following are some examples:
1. How many decimeters do 5 meters include?
Solution:
1 m = 100 cm
Therefore, 5 m = 100 × 5 = 500 cm
Since, 1 dm = 0.1 m
Therefore, 500 cm will be 500 × ^{1}⁄_{10}
Hence, 5 m = 50 dm
2. Convert 250 dm into centimetres
Solution:
1 dm = 10 cm
Therefore, 250 dm = 250 × 10
= 2500 cm
The commonly used units of measurement are millimeter, centimeter, meter, and kilometer. A decimeter is not as widely used, but is an important unit. In real life, we rarely find measurements written in decimetre. Since one meter is not a very long length, it is easier to use 0.1 m or 0.5 m when the length is shorter than a meter.
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