Decimeter is the unit of length in the third grade of primary school, and there are meters, centimeters and millimeters. So 1 m is equal to 10 decimeter, and 1 decimeter is equal to 10 cm, which is the small scale of 100 on the ruler.

The unit of length refers to the basic unit for measuring spatial distance, which is formulated by human beings to standardize the length. Its international unit is "meter" (symbol "m"), and commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (micron) and nanometer (nm). Length units play an important role in various fields.

Brief introduction of other units

The definition of "unit" in Modern Chinese Dictionary is: the name of the standard quantity to measure things. In measurement, a certain kind of quantity is taken as a reference quantity to determine how many times the known quantity is equivalent to the reference quantity, which is called a unit.

For example, centimeter is the unit for measuring length, gram is the unit for measuring mass, and second is the unit for measuring time. As an example of 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.