How do you convert measurements from one kind of unit to another?

You have to see the relation between the units.

for an example ur one value is 2 meters and you have to convert it into centimetres

as 1 m = 100 cm

so 2 m = 2 * 100

i. e 2 * 100 = 200 cm

Therefore 2 m is same as 200 cm