The word "sum" means that we have to add.
3/4 + 18/19 (least common denominator= 76)
= 57/76+ 72/76
= 129/76
= 1 53/76.
The sum of 3/4 and 18/19 is 1 53/76~

mtg

3/4+18/19 LCM of 4 and 19 is 76 Then multiply 3 by 19 and 18 by 4 and add it (57+72)/76 (129)/76= 1.697