670 milligrams = 0.00067 kilograms. As there are 1000 grams to a kilogram, and 1000 milligrams to a gram, you have to calculate 670 / (1000*1000)
1 kilogram equals 1000 grams, and 1 gram equals 1000 milligrams. Therefore, there are 1000 x 1000, or 1,000,000 milligrams in a kilogram. So therefore there are 12,000,000 milligrams in 12 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 2.5 kilograms is equal to 0.25 x 1000000 = 250000 milligrams.
There are 1000 x 1000 = 1000000 milligrams in one kilogram. Therefore, 3 milligrams is equal to 3/1000000 = 0.000003 kilograms.
There are 1000 x 1000 = 1000000 milligrams in one kilogram. Therefore, 85000000 milligrams is equal to 85000000/1000000 = 85 kilograms.
There are 1000 x 1000 = 1000000 milligrams in one kilogram. Therefore, 32.1 milligrams is equal to 32.1/1000000 = 0.0000321 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 10000 milligrams is equal to 10000/1000000 = 0.01 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 500 milligrams is equal to 500/1000000 = 0.0005 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 99 milligrams is equal to 99/1000000 = 0.000099 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 452 milligrams is equal to 452/1000000 = 0.000452 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 20 milligrams is equal to 20/1000000 = 0.00002 kilograms.
One kilogram is equal to 1000 x 1000 = 1000000 milligrams. Therefore, 4 milligrams is equal to 4/1000000 = 0.000004 kilograms.