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by Frozenlock 3995 days ago
Right:

"A space should be left between groups of 3 digits on either the right or left hand side of the decimal place (15 739.012 53). In four digit numbers the space may be omitted. Commas should not be used."

http://www.npl.co.uk/reference/measurement-units/si-conventi...

In addition, put the odd unit in parentheses, not the SI one.

> 1 674.4 km/h (1000 mph)