1/6 + 1/7 needs to have common denominators to be successfully added. 6 and 7 are most common multiples of 42. We can achieve the common denominator by multiplying the fraction by the denominator of the other fraction.
1/6 (7) + 1/7 (6) = 7/42 + 6/42 = 13/42 which is the simplest form of the fraction.
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