To add 2 fractions you multiply the denominator from one fraction by the denominator of the other fraction as well as the numerator and then do the same for the other fraction.
To add 3 fractions you should find the LCM of the 3 denominators. Then multiply the number you multiplied the denominator by to get it to your LCM by your numerator and then repeat these steps for the remaining 2 fractions.
