You make you're calculations using has many (or more) significant figures as requested without any further considerations until you get to the final result...
You reduce the final results significant figures to the requested one or add zeros at the end to match it if it is an exact result
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3 significant figures.
5 significant figures.
6040 has 3 significant figures.
The simple rule is: no more significant figures than the least accurate of the values in the computation. For multiplication and division, the result should have as many significant figures as the measured number with the smallest number of significant figures. For addition and subtraction, the result should have as many decimal places as the measured number with the smallest number of decimal places. (Rounding off can be tricky, but that would be another thread)