Tính:3 kg × 2 = 3 m × 8 = 3 l × 7 = 3 dm × 4 = 3 km × 9 = 3 mm × 10 =

3 kg × 2 = 6 kg

3 m × 8 = 24 m

3 l × 7 = 21 l

3 dm × 4 = 12 dm

3 km × 9 = 27 km

3 mm × 10 = 30 mm