They both equal the same as long as there are no numbers before the zeroes.
1 mg is equal to 1000 mcg
Yes, 90kg is equal to 90,000,000 mg.
0003 or three. If you want, you can say 'zero zero zero three'.
0.4 mg is equal to 0.006 grain.
15000 mg
9000 mg
65,000 mg
Gr.ss= mg
Yes
Accordingly, 1 ml = 1/7.5 mg = 0.133 mg
600mg is equal to 600000mcg (1000mcg per mg).