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A fifth of a gram as a decimal would be 1/5 or 0.2 grams
Multiply by 1000. So 1 milligram equals 1000 micrograms.
0.5 micro gram = 0.5 x 1000 = 500 nano grams. Hence 779.4 nano grams is greater than 0.5 micro grams by 279.4 nano grams
You can write it as a fraction; you can write it as a decimal; or you can convert that to milligrams.
The density in this case is expressed in gram / cubic centimeter, or the equivalent kilogram / liter. It means that on average, every liter of Earth matter has a mass of 5.52 kilograms. In standard SI units (as opposed to some decimal multiple), that would be 5520 kilograms per cubic meter.