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How to convert between units.
So for example If you wanted to convert from 12.5 km to m you would find out how many meters in 1 km, this is 1000 then figure 1000 x 12 and a half and this would be 12,500 meters.

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Conversion between metric units | Ratios, proportions, units, and rates | Pre-Algebra | Khan Academy

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Hectare - A metric unit the size of 10,000 square meters.
Area - A region or part of a town, country and world.
Gram - A metric unit of mass equal to 1 thousandth of a kilogram.
Milliliter - A unit of mass space equal to one thousandth of a liter.
Tonne - A unit of mass equal to 1000 kilogram.