Spell out the number if the unit of measurement is written out and use a numeral when the unit of measurement is abbreviated.

Small_OK The surface area of the School’s premises is five hundred square metres.
Small_OK The conference hall is 2 km from here.

Do not use points or plurals with abbreviated units of measurement. Insert a non-breaking space between the numeral and the unit.

Small_OK 2 m
Small_OK 6 km
Small_OK 10 min

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