Math CentralQuandaries & Queries


Question from John, a student:

I've completely forgot anything to do with the subject mentioned, so my question is straight to the point..

I need to know how to do the following problem (Preferably do not give me an answer though)
(k/3k-8) - (4/k+2)

Hi John,

If you want to add 3/7 and 5/6 then you need to first find a common denominator. Since 7 and 6 have no common factors the best common denominator is 7 × 6 = 42. Thus

numeric fractions

You can use a similar procedure to add or subtract algebraic fractions. For example

algebraic fractions

I hope this helps,

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