For this case we have to, by definition:
The sum of fractions with the same denominator consists of adding the numerators and placing the same denominator.
For example:
[tex]\frac {a} {b} + \frac {c} {b} = \frac {a + c} {b}[/tex]
So:
When fractions have the same denominator, their sum also has the same denominator.
Answer:
When fractions have the same denominator, their sum also has the same denominator.
