Remember that there are 1,000 grams in a kilogram.
So, given a mass in kg, we multiply by 1,000 to convert this to g.
Any additional grams must be added on.
Examples:
6.2 kg = 6.2 x 1,000 = 6,200 g
6.25 kg = 6.25 x 1,000 = 6,250 g
6.025 kg = 6.025 x 1,000 = 6,025 g
6 kg 20 g = 6 x 1,000 + 20 = 6,020 g
Shall we have a go at some questions now?