### Theory:

We use different unit measures for different sizes.

 Size Metric unit for length Metric unit for weight Metric unit for volume Large ones Kilometre Kilogram Kilolitre Medium ones Metre Gram Litre Small ones Centimetre Centigram Centilitre Very small ones Millimetre Milligram Millilitre

The easy way to remember unit conversion is conversion stairs.

Important!
1. To convert higher unit to lower unit multiply the given measures by the powers of $$10$$'s.

2. To convert lower unit to higher unit divide the given measures by the powers of $$10$$'s.