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\frac{1}{3}=\frac{3}{21}+\frac{1}{21}
Least common multiple of 7 and 21 is 21. Convert \frac{1}{7} and \frac{1}{21} to fractions with denominator 21.
\frac{1}{3}=\frac{3+1}{21}
Since \frac{3}{21} and \frac{1}{21} have the same denominator, add them by adding their numerators.
\frac{1}{3}=\frac{4}{21}
Add 3 and 1 to get 4.
\frac{7}{21}=\frac{4}{21}
Least common multiple of 3 and 21 is 21. Convert \frac{1}{3} and \frac{4}{21} to fractions with denominator 21.
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Compare \frac{7}{21} and \frac{4}{21}.
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