Evaluate
-\frac{13}{20}=-0.65
Factor
-\frac{13}{20} = -0.65
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\frac{1}{20}-\frac{14}{20}
Least common multiple of 20 and 10 is 20. Convert \frac{1}{20} and \frac{7}{10} to fractions with denominator 20.
\frac{1-14}{20}
Since \frac{1}{20} and \frac{14}{20} have the same denominator, subtract them by subtracting their numerators.
-\frac{13}{20}
Subtract 14 from 1 to get -13.
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