## Introductory Algebra for College Students (7th Edition)

The sum or difference of two fractions with identical denominators is the sum or difference of their numerators over the common denominator. $\displaystyle \frac{a}{b}+\frac{c}{b}= \displaystyle \frac{a+c}{b}$
The sum or difference of two fractions with identical denominators is the sum or difference of their numerators over the common denominator. $\displaystyle \frac{a}{b}+\frac{c}{b}= \displaystyle \frac{a+c}{b}$ Example $\displaystyle \frac{5}{12}+\frac{1}{12}=\frac{5+1}{12}$ $=\displaystyle \frac{6}{12}=\frac{(6)}{(6)\times 2}=\frac{1}{2}$ Example $\displaystyle \frac{5}{12}-\frac{1}{12}=\frac{5-1}{12}$ $=\displaystyle \frac{4}{12}=\frac{(4)}{(4)\times 3}=\frac{1}{3}$