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\frac{20}{420}-\frac{21}{420}=5
Least common multiple of 21 and 20 is 420. Convert \frac{1}{21} and \frac{1}{20} to fractions with denominator 420.
\frac{20-21}{420}=5
Since \frac{20}{420} and \frac{21}{420} have the same denominator, subtract them by subtracting their numerators.
-\frac{1}{420}=5
Subtract 21 from 20 to get -1.
-\frac{1}{420}=\frac{2100}{420}
Convert 5 to fraction \frac{2100}{420}.
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Compare -\frac{1}{420} and \frac{2100}{420}.
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