Converting to grams:
Converting these values to grams will make them easier to subtract
3 kg 924 grams OR 3.924 kg = 3924 grams
1kg 893 grams OR 1.893 kg = 1893 grams
Subtracting:
Now that we have the values in grams, we will put them in their initial order and subtract them
3924 - 1893 = 2031 grams = 2.031 kg OR 2 kg 31 grams