What fraction of 2kg is 20 g?

Well sweetheart, 20 grams is 0.02 kg. So, if we're talking about 2 kg, the fraction of 20 g in 2 kg is 0.02/2, which simplifies to 1/100. So, in simple terms, 20 g is 1/100 of 2 kg. Hope that clears things up for you, pumpkin!