House of Math

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} c \neq 0

Rule

\frac{a}{c} - \frac{b}{c} = \frac{a - b}{c} c \neq 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}

Video Crash Courses

Want to watch animated videos and solve interactive exercises about fractions? Click here to try Video Crash Courses!

Want to know more?Sign UpIt's free!

Done