Explicație pas cu pas:
140 hm - 1 km + 240 dam + 50 m = ? dam
140 hm = 1400 dam ( / · 100 )
1 km = 100 dam ( / · 100 )
240 dam = 240 dam
50 m = 5 dam ( / : 10 )
1400 dam - 100 dam + 240 dam + 5 dam =
= 1300 dam + 240 dam + 5 dam
= 1540 dam + 5 dam
= 1545 dam