What is 0.8 written as a decimal?

8/10

Step-by-step explanation:

I think that you are probably looking for 0.8 as a fraction because it is a decimal already.

So, 0.8 means %80 such as 8 points out of 10 points

This can be represented as 8/10

There are also many other ways to write it, but it will always simplify down to 4/5.  Example:  8/10, 16/20, 24/30