How does the metric system work?

Hint : Metric system deals with the units of measurement like meter, centimetre, litre, gram etc. The units measuring the same physical quantity can be converted from one unit to another. Each unit differs from the other in a multiple of $10$.

Complete Step-By-Step Solution:
We know that the work of the metric system is to put the unit that we use after each physical quantity.
The metric system consists of two types of units, one is the base unit and the other is the derived units.
Base units refer to those units, which can be used to derive other units in the system. The seven base units are as follows:
Length-meter $(m)$
Time-second $(s)$
Amount of substance-mole $(M)$
Electric Current-Ampere $(A)$
Temperature-Kelvin $(K)$
Luminous Intensity-Candela $(Cd)$
Mass-Kilogram $(Kg)$
Derived units are those units which are formed due to a combination of base units. Derived units include units of volume, density etc. The unit of volume is: $({m^3})$and density is $(Kg/{m^3})$.
The metric system is also known as the decimal system of units as it deals with the number $10$. The units of a system can be converted from one unit to another by either multiplying or dividing by $10$.

Note:
Metric system is very easy to memorize. The following phrase is a very common way to remember the units in the decreasing order. The phrase goes as “King Henry Died Drinking Chocolate Milk. Here the first letter of each word corresponds to, Kilo, Hecta, Deca, Deci, Centi, Mili. They are in descending order; hence we need to multiply $10$ as we go up the order.