Since the rope is 8 meters long you will need to divide to find out how many 2/5 meter pieces can be cut from it.
So 8 divided by 2/5 will equal 20
Dividing is like multiplying
8 2 8 5
-- / --- = --- x ---
1 5 1 2
8 times 5 = 40 and 1 times 2 = 2, so it is 40 over 2
which is also equal to 20