2 3/8 km + 30 1/2 dam - 4.500 cm = ........ dam

2 3/8 = 19/8 km = 2,375 dam
30 1/2 = 61/2 dam = 30,5 dam
4500 cm = 4,5 dam

2,375 + 30,5 - 4,5 = 28,375 dam

2 3/8 km + 30 1/2 dam - 4.500 cm =.......... dam

= 2 3/8 km = 2 3/8 x 100 = 475/2 = 235,25 dam
= 30 1/2 dam, karena sudah dam maka dijadikan desimal saja = 61/2 = 30,5          dam.
= 4.500 cm = 4.500 : 1000 = 4,5 dam

jadi tinggal dijumlahkan saja

= 235,25 dam + 30,5 dam - 4,5 dam
=28,275 dam.

semoga bermanfaat ya ;)