1/4 + 1/5
Change these fractions to equal fractions with the same denominator.
1/4=5/20
1/5=4/20
To add fractions with different denominators, you need to find a common denominator. In this case, the common denominator is 20.
To get this common denominator, you can multiply the numerator and denominator of the first fraction (1/4) by 5, and multiply the numerator and denominator of the second fraction (1/5) by 4.
So, the calculation becomes:
(1/4) * (5/5) + (1/5) * (4/4) = 5/20 + 4/20
Now that the fractions have the same denominator, you can add the numerators:
5/20 + 4/20 = 9/20
Therefore, 1/4 + 1/5 equals 9/20.