Answer:
Subracting = 1/15 . Adding = 11/15
Explanation:
Subtracting
2/5 - 1/3
The denominators must be the same, so convert both to 15
Multiply the denominator up to 15, along with using the same multiplier for the numerator
6/15 - 5/15 = 1/15
Adding
2/5 - 1/3
6/15 + 5/15 = 11/15