S K Gupta and Anubhuti Gangal Solutions for Exercise 4: Mental Maths

If $\frac{3}{5}=\frac{k}{20}$, then the value of $k$ is _____.

If $\frac{3}{8}=\frac{9}{k}$, then the value of $k$ is _____.

How many hours are $\frac{3}{8}$ of a day?

How many fourths are there in $3$ ?

$\frac{9}{21}+\frac{3}{21}-\frac{7}{21}$

$3\frac{1}{4}+10\frac{3}{4}$

$18\frac{2}{7}-13\frac{1}{7}$

The length of a stick is $45 \mathrm{m}$. What is the length of $\frac{2}{9}$ of the stick?