Hello!
Answer:

Explanation:
Wa want to convert 0.68m in dam.
We have this table:
Let's put 0.68m:
km dam hm m dm cm mm
0 . 6 8
Translate 0.68m into dam by moving the comma to the left until you reach dam:
km hm dam m dm cm mm
0 . 0 6 8
So 0.68m = 0.068dam