Add. Write each sum in the lowest terms.
We have 34+15
The least common multiple of the denominators (4,5)=20(given)
34+15=1520+420(changing34&15inequivalentfractionhavingdenominatoras20)=15+420=1920
Therefore, the required sum in the lowest term is 1920.
15+12
13+14
16+712_____