You would measure a tractor trailer in grams.
2.4kgs = 2400 grams.
3.5kgs = 3500 grams.
6.4kgs = 6400 grams
0.450kgs = 450 grams
60kgs = 60,000 grams.
0.03
3.645 grams (1 kg = 1000 grams)
We have no idea how one would measure length in mass units.
0.344 kg = 344 grams
6000
0.025.
2000g are in 2kg