Hi There!
So basically you have to add, whenever you add with the same denominator you just add the numerator.
Steps
1. Add \(\frac{4}{5}\) + \(\frac{1}{5}\)
2. Since they have the same denominators add the numerators, 1+4=5
3. You're total answer should be \(\frac{5}{5}\), whenever you get the same number in the numerator and the denominator the answer will always be one.
Final Answer, \(\frac{1}{5}\) + \(\frac{4}{5}\) equals to one.
Hope This Helps :)