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.
 
conersion.PNG
 
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.