300 grams is what fraction of 1 kg?

To find the fraction of 300 grams in 1 kg, you need to convert both units to the same measurement. Since 1 kg is equal to 1000 grams, you can express 300 grams as a fraction of 1000 grams. Therefore, 300 grams is 300/1000 or 3/10 of 1 kg.