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Example 7/30 + 11/42

Find the LCM of 30 and 42.

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCM

Convert the fractions to common denominators.

49/210 + 55/210 = 104/210 or 52/105

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