It equals 7/15 1. find the least common multiple of the 2 denominators(bottom numbers) for this problem: the lcm is 15(3 times 5) 2. the fractions will now be 10/15(2/3) and 3/15(1/59 3. subtract ONLY the numerators(upper numbers) 4. 10-3=7 5. your answer will be 7/15