Question

6.285×10^3 mg = _____? _____ kg

Answer 1

One kilogram is equal to one thousand grams. Further, one gram is equal to 1000 mg. The conversion is as shown below,
                    (6.285 x 10³ mg) x (1 g / 1000 mg) x (1 kg / 1000 g)
The numerical value of the operation above is 0.006285 kg. 

Answer 2

1 mg ------------------------ 1 x 10⁻⁶ kg
6.285x10³------------------ ( mass kg )

mass Kg = ( 6.285x10³ ) x (  1 x 10⁻⁶ kg )

= 0.006285 kg

hope this helps!