Answer :

[tex] \frac{5}{12} + \frac{3}{8} [/tex] Find the LCM, which is 24. 

[tex] \frac{10}{24} + \frac{9}{24} = \frac{19}{24} [/tex]
to add, convert the denomenators to the same numjber by finding the least common multiple of 12 and 8

so factor
12=2 times 2 times 3
8=2 times 2 times 2

LCM=2 times 2 times 2 times 3=24


so convert so bottom number=24
5/12 times 1 or 2/2=10/24
3/8 times 3/3=9/24

so
5/12+3/8=10/24+9/24=19/24

the answer is 19/24