420 Hm - 14 km + 4500 dam berapa dam

420 Hm - 14 km + 4500 Dam
=420 Hm = hm turun ke dam 1 langkah atau dikali 10 = 4200
14 Km = km turun ke dam 2 langkah atau dikali 100 = 1400
= 4200 - 1400 + 4500
= 2800 + 4500
= 7300

Diketahui : 
1 Hm = 10 dam
1 Km = 100 dam 
Jadi,
420 Hm = 420x10 = 4200 dam
14 Km = 14x100 = 1400 dam

420 Hm - 14 Km + 4500 dam = 4200 dam - 1400 dam + 4500 dam = 7300 dam

Semoga membantu :)