Adding Fractions with VariablesDate: 03/21/97 at 11:00:27 From: lilly somer Subject: Adding Fractions with Variables What do I do here? 7/53 + 23/n = ? Date: 03/21/97 at 11:25:32 From: Doctor Rob Subject: Re: Adding Fractions with Variables To add fractions, you need to find a common denominator. This is a number which is a multiple of both 53 and n. In this case, 53*n works. Next you need to write each fraction using the common denominator instead of its given one. In this case, 7/53 = (7*n)/(53*n), by multiplying both numerator and denominator by n, and 23/n = (53*23)/(53*n), by multiplying both numerator and denominator by 53. Now that the fractions have the same denominator, you can add them by adding the numerators and putting that sum over the common denominator. Then simplify the resulting fraction as much as possible. This is just the same process you learned when studying fractions earlier, like adding 3/4 + 1/6. -Doctor Rob, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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