5 km=…hm=…dam=…m

5km = 50 hm
5km = 500 dam
5km = 5.000 m

5 km = 50 hm = 500 dam = 5.000 m

5 km = 5 x 10 = 50 hm
50 hm = 50 x 10 = 500 dam
500 dam = 500 x 10 = 5000 m

maka :
5 km = 50 hm = 500 dam = 5000 m