1 and 4/5 is a mixed number.
To convert it to a fraction, convert the whole number 1, to fraction form with the same denominator as 4/5, which is 5.
1 = 1/1 = 5/5
Now add 5/5 and 4/5.
5/5 + 4/5 = 9/5
So 1 and 4/5 = 9/5
The answer is 9/5
Hope this helps!