5 kg is greater than 0.5 kg.
0.5 is less than 1, and it isn’t a full number. 1,000 grams is the equivalent of 1 kg, which means 0.5 kg is the equivalent to half of a kilogram, which is 500 grams.
5 kg (or 5,000 grams) > 0.5 kg (or 500 grams)
5 kg is more than 0.5 kg.