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To add/subtract fractions, the denominators (bottom numbers) must be equal; so first convert the fractions into equivalent fractions with the same denominator. Then the numerators (top numbers) are added/subtracted and the resulting fraction simplified:

1/3 + 3/5 = (1×5)/(3×5) + (3×3)/(5×3)

= 5/15 + 9/15

= (5+9)/15

= 14/15

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