Answer:
2/5 + 3/8 =
LCM of 5 and 8 is 40
=so 40 is divided by the denominator of the 1st fraction that is 5 ,you get 8 now multiply 8 by numerator that is 2 you will get 16.
And the same applies for 2nd fraction 40÷8=5 then 5 × 3 = 15
now you say 16 + 15/40(LCM) you get 31/40
the whole fraction is 40/40
40/40 -31/40
= 9/40
● so the answer is 9/40
hope this helps