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Converting units of mass is very simple once you get the hang of it. Pretty much all you need to know is these conversions.
1000mg = 1g
1000g = 1kg
1000kg = 1 tonne
For example I will convert 6500g to kg's. So there is 1000g in 1kg so if we have got 6500g we have 6 groups of 1000 and one group of 500 which if we convert it will be 6.5kg.

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Metric system: units of weight | 4th grade | Khan Academy

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Converting Units With Conversion Factors

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Tonne - A unit of weight equal to 1,000kg.
Hectare - A metric unit equal to 10,000 square metres.
Clinometer - A instrument used to measuring angles or elevations.
Weight - Weight is the mass of an object.
Mass - usually and large body matter with no definite shape.