All countries over the world use a unit system that is known as the ‘International system of Units’, The SI unit of length is meter, each meter (m) is divided into hundred equal divisions, each division is called as the centimeter (cm), each centimeter is further divided into ten smaller divisions and each smaller division is known as the millimeter (mm).
1 meter = 100 centimeters
1 centimeter = 10 millimeters
1 meter = 1000 millimeters
For measuring large distance, we use a bigger unit called the kilometer (km).
1 kilometer = 1000 meters
