Problems based on Numbers Test 4

With $\frac{1}{2}$ and $\frac{3}{5}$, we can multiply the numerator and the denominator with 10 and 4 respectively.
$\frac{1}{2}\times \frac{10}{10}=\frac{10}{20}$ and $\frac{3}{5}\times \frac{4}{4}=\frac{12}{20}$
The rational number between $\frac{10}{20}$ and $\frac{12}{20}$ is $\frac{11}{20}$. So, the rational number is $\frac{11}{20}$ that between $\frac{1}{2}$ and $\frac{3}{5}$.