Add and Subtract Fractions with Different Denominators

Read this text for more examples and guidance. It gives a good review of how to find common denominators. Pay attention to the "How To" section at the beginning for an overview of the process. Do Examples 4.67 – 4.72 and check your answers.

Exercises

EXAMPLE 4.67

Add: \dfrac{1}{2}+\dfrac{1}{3}.


EXAMPLE 4.68

Subtract: \dfrac{1}{2}-\left(-\dfrac{1}{4}\right).


EXAMPLE 4.69

Add: \dfrac{7}{12}+\dfrac{5}{18}


EXAMPLE 4.70

Subtract: \dfrac{7}{15}-\dfrac{19}{24}.


EXAMPLE 4.71

Add: -\dfrac{11}{30}+\dfrac{23}{42}.

EXAMPLE 4.72

Add: \dfrac{3}{5}+\dfrac{x}{8}.