1 m = 10 decimeter = 100 cm;

1 decimeter =10cm =100mm;

1 cm =10mm.

Introduction:

To understand the unit of length, we must first understand its advanced concept-unit. Modern Chinese Dictionary defines the unit as the name of the standard quantity to measure things. In measurement, taking a similar quantity as a reference quantity, the number of times a known quantity corresponds to the reference quantity is determined, which is called a unit. For example, centimeters are units of length, grams are units of mass, and seconds are units of time. For example, in mathematics, it can also be said that 1 is the unit of natural number, and the fraction with the numerator of 1 is the unit of fraction.

When measuring the length of a line segment, you need to select the line segment as the measurement standard and specify its length as 1, which is called the length unit. There are many units in length. The main unit is rice, and the rest are derived units. When measuring, choose the appropriate length unit according to the actual needs. For example, the length of the runway is in meters, the distance between two cities is in kilometers, and the distance of long jump is in centimeters.