Question

8m+..........m=1dam
890hl+340hl=kl
200hg-300g=.......hg
200ani+30decenii+..................secole=1mileniu

Answer 1

8 m + 2 m = 1 dam 
890 hl + 340 hl = 1230 hl = 123 kl
200 hg - 300 g = 200 hg - 3 hg = 197 hg
200 ani + 30 decenii + 5 secole = 1 mileniu 

Answer 2

8m+2m=10m=1dam; m< dam de 10 ori; 1 dam=10 m
890hl+340hl=1230hl=123kl
200hg-300g=200hg-3hg=197hg
200ani+30decenii+5secole=1mileniu
1mileniu=1000ani=10secole
200 ani+300ani+500ani=1000ani