You need to be familiar with the following terms for units of measurement. 

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Units of distance:

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Millimetres (mm), Centimetres (cm), Metres (m), Kilometres (km)

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10 mm    =  1 cm

100 cm   =  1 m

1 000 m  =  1 km

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Units of weight:

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Milligrams (mg), Grams (g), Kilograms (kg)

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10 mg      =  1 g

1 000 g    =  1 kg

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Units of volume:

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Metric system: Millilitres (ml), Litres (l)

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1 000 ml  =  1 litre