# Plus and Minus (Equal Denominators)

When adding or subtracting fractions with equal denominators, you just add or subtract the numerators and keep the denominator as it is.

Rule

 $\frac{a}{c}+\frac{b}{c}=\frac{a+b}{c}\phantom{\rule{2em}{0ex}}c\ne 0$

Rule

### SubtractionofFractionswithEqualDenominators

 $\frac{a}{c}-\frac{b}{c}=\frac{a-b}{c}\phantom{\rule{2em}{0ex}}c\ne 0$

Example 1

Compute $\frac{1}{4}+\frac{2}{4}$ and $\frac{4}{6}-\frac{3}{6}$

Using the rule above, you get that

 $\frac{1}{4}+\frac{2}{4}=\frac{1+2}{4}=\frac{3}{4}$

The same goes for subtraction, only now you have to subtract:

 $\frac{4}{6}-\frac{3}{6}=\frac{4-3}{6}=\frac{1}{6}$

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