430 mg is 0,000 430 kg.
1 kilogram = 1000 grams so 430 grams are less than 1 kilogram. However 430 grams can be written as a fraction of a kilogram as .43 kilogram
0.43kg
4.5 grams = 4,500 mg
1.2 mg = 0.0012 grams
17 mg is .017 grams
0.751 grams is 751 mg.
There are 12,350 mg in 12.35 grams.
280mg is 0.28 grams (divide mg by 1,000 to get grams).
855mg is 0.855 grams (mg x 0.001 = grams).
87.6 mg = 0.0876 grams
3,675 mg = 3.675 grams