Cara atau jawaban dari 4hm+2dam+5m=

(4x100) + (20 x10) + (5) = 425 meter

*(Kalo dijadikan m)* 
4hm + 2dam + 5m =.......m
4 hm = 4 x 100 = 400 m
2 dam = 2 x 10 = 20 m
 = 400 + 20 + 5 = 425 m

*(Kalo dijadikan dam)*
4hm + 2dam + 5m = .......dam
4hm = 4 x 10 = 40 dam
5 m = 5 / 10 = 0,5 dam
 = 40 + 2 + 0,5 = 42,5 dam

*(Kalo dijadikan hm)*
4hm + 2 dam + 5 m = .......hm
2 dam = 2 / 10 = 0,2 hm
5 m = 5 / 100 = 0,05 hm
4 + 0,2 + 0,05 = 4,25 hm

*(Semoga membantu)*