Which is the rational number between -\frac{2}{5}\ and\ \frac{1}{2}?
-\frac{2}{5}\times\frac{4}{4}=-\frac{8}{20}
\frac{1}{2}\times\frac{10}{10}=\frac{10}{20}
\frac{1}{20} is the rational number between -\frac{2}{5}\ and\ \frac{1}{2}.
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