1: 6 tons and 4 kg < 6,200 kg

2: 3000 cubic decimeter < 5 cubic meters < 5003 cubic decimeter < 5.03 cubic meters < 5.3 cubic meters

Arrange from big to small

1:4.3m2 > 4.03m2 > 43m2 > 40.3m2.

2: 3 hours and 45 minutes > 3 1/2 1 hour > 3 hours 15 seconds > 3.75 minutes

3: 5. 12 liter > 5 liter, 7 ml > 5 cubic decimeter > 130 cubic centimeter.