Evaluate
\frac{p}{8}+\frac{q}{7}
Factor
\frac{7p+8q}{56}
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\frac{7p}{56}+\frac{8q}{56}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 8 and 7 is 56. Multiply \frac{p}{8} times \frac{7}{7}. Multiply \frac{q}{7} times \frac{8}{8}.
\frac{7p+8q}{56}
Since \frac{7p}{56} and \frac{8q}{56} have the same denominator, add them by adding their numerators.
\frac{7p+8q}{56}
Factor out \frac{1}{56}.
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