Add: 8/
15
+ 3/
15
= 8 + 3/
15
= 11/
15
It is suitable to adjust both fractions to a common (equal, identical) denominator for adding, subtracting, and comparing fractions. The common denominator you can calculate as the least common multiple of both denominators - LCM(15, 15) = 15. It is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 15 × 15 = 225. In the following intermediate step, it cannot further simplify the fraction result by canceling.
In other words - eight fifteenths plus three fifteenths is eleven fifteenths.