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Four times ten; thirty-nine and one more., The sum of four tens; forty units or objects., A symbol expressing forty units; as, 40, or xl.
It is 7 millimetres. Expressing a measurement as a fraction does not imply that the measurement unit should be changed. If you want 7 mm expressed as a fraction of some other units: an inch or a kilometre, for example, it is up to you to specify which other unit you want.
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You may not have any units. Standard units are not used in data on household size, for example.
Two common units for mass are kilograms and grams