4 1/2km-5hm+80dam=...m

4 1/2 km= 4.500 m
5 hm= 500 m
80 dam= 800 m
4500-500+800
4000+800
4800 m
jadi jawabannya 4800 m

4 1/2 km - 5hm + 80 dam = ...... m
km > m = 4 dikali 1000 + 1/2 dikali 1000 = 4.000 + 500 = 4.500 m.
hm > m = 5 dikali 100 = 500 m.
dam > m = 80 dikali 10 = 800 m.
m = 4.500m - 500m + 800m = 4.000m + 800m = 4.800 m
catatan :
1 km = 1000 m
1 hm = 100 m
1 dam =10 m