Subtract these measurements, using significant digit rules: 43.278 kg - 28.1 g = kg

Answer: 43.2

Calculations:

All you need to do is subtract 43.278 kg - 28.1 g (or 0.0281 kg) = 43.2499

Then to round significant figures (digits) you round down, making it 43.2 (that's rounded to 3 significant figures).

28.1 grams is 0.0281 kg.

43.278 kg - 0.0281 kg = 43.2499 or if you round - > 43.250