Question

Fill in the blanks:

$\frac{1}{2}-\frac{9}{20}=\_\_\_$

Answer 1

• Step 1: The least common denominator (LCD) of $2$ and $20$ is $20$. Make the denominator as $20$ for both the fractions.

$\frac{1}{2}=\frac{1\times 10}{2\times 10}=\frac{10}{20}$;

$\frac{9}{20}=\frac{9\times 1}{20\times 1}=\frac{9}{20}$

• Step 2: Subtract the numerators and write the difference over the common denominator.

$\frac{10}{20}-\frac{9}{20}=\frac{10-9}{20}=\frac{1}{20}$

• Hence, $\frac{1}{2}-\frac{9}{20}=\frac{1}{20}$.