Yes, saying a fifth is just the same as saying 1 fifth. much like saying i want a sweet or i want one sweet.
0.2
12cm
one fifth
8ml
2 million but come on are you serious just do one fifth of 10 then add the million
One-fifth of the tank
352 yards
20 % is one fifth.
one and fifth of an hour
One fifth of 30 gallons of water is 6 gallons (30 divided by 5).
One hundred (100) pence to the pound, so one fifth (1/5) of a pound is twenty (20) pence