First, find the least common multiple of 5 and 8 so that you convert both numbers to fractions with the same denominator.
The least common multiple of 5 and 8 is 40, since their greatest common factor is 1.
To convert 2/5 to ?/40 , multiply by 8/8 , so 2/5 x 8/8 = 16/40.
To convert 5/8 to ?/40 , multiply by 5/5 , so 5/8 x 5/5 = 25/40.
Now, you can perform the desired operation on the two fractions.
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