Evaluate
\frac{m}{16}+\frac{5}{42}
Factor
\frac{21m+40}{336}
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\frac{21m}{336}+\frac{5\times 8}{336}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 16 and 42 is 336. Multiply \frac{m}{16} times \frac{21}{21}. Multiply \frac{5}{42} times \frac{8}{8}.
\frac{21m+5\times 8}{336}
Since \frac{21m}{336} and \frac{5\times 8}{336} have the same denominator, add them by adding their numerators.
\frac{21m+40}{336}
Do the multiplications in 21m+5\times 8.
\frac{21m+40}{336}
Factor out \frac{1}{336}.
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