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It is required to know the sum of 17/36 19/36 12/36 18/36, here you have one common Denominator, which is 36, and the sum of Numerators, 17, 19, 12, 18, is 66, which put as a Numerator over the Deno∣minator thus 66/3, and by the former Rules of the last Chapter you may reduce them to the mixt number 1: 30/36.
But if the Fractions that are required to be added together be of unequal and diffe∣rent Denominators, bring them a com∣mon Denominator by the 7th Rule of the last Chapter, and having so reduced them follow the foregoing instructions.