Câu 2. Số

8 hm = ….m                              8 m = ….dm

9 hm = ….m                              6 m = ….cm

7 dam = ….m                              8 cm = ….mm

3 dam = ….m                              4 dm = ….mm

Giải:

8 hm = 800 m                              8 m = 80 dm

9 hm = 900 m                              6 m = 600 cm

7 dam = 70 m                              8 cm = 800 mm

3 dam = 30 m                              4 dm = 400 mm.