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its easy for them for large calculation by short methods ...
The metric system is able to measure things to a very very precise amount. The metric system is also very easily convertable.
You can break anything down to make it precise. 1", 1/2", 1/4", 1/8", 1/132....whatever. Here is the real answer:
Increments of 10.
How many inches in a foot? 12
How many centimeters in a meter? 100
How many feet in a mile? 5280
How many meters in a kilometer? 1000
How many inches in a mile: 5280 x 12
How many centimeters in a kilometer? 100 x 1000
Which one would you rather calculate? :)
Now, add to that measures of volume...
How many cubic inches in a pint? (I'll leave you to figure this out if you want).
How many cubic centimeters in a Liter? 10
Now weigh that same amount....
A pint of water weighs? Whatever, you'll need to do the calculations for this, too.
A Liter of water, however, weighs 1000 grams (or, 1 kilogram).
So, you can see that conversions take much less time and thought (so long as I didn't type something incorrectly). :)