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Same denominator: just add/subtract numerators. 2/5 + 1/5 = 3/5. 4/7 - 2/7 = 2/7. Different denominators: find LCM first. 1/2 + 1/3: LCM of 2 and 3 = 6. 1/2 = 3/6, 1/3 = 2/6. Sum = 5/6. Mixed numbers: add wholes and fractions separately. 2ยฝ + 1ยผ = (2+1) + (ยฝ+ยผ) = 3 + 3/4 = 3ยพ.