How much must be added to 830 grams to make 1 kg?

To convert grams to kilograms, you divide by 1000 since 1 kg is equal to 1000 grams. Therefore, to find out how much must be added to 830 grams to make 1 kg, you subtract 830 grams from 1000 grams, which equals 170 grams. So, 170 grams must be added to 830 grams to make 1 kg.