Question 1(d) :

Sove:

$\frac{5}{7}+\frac{1}{3}$

$\frac{5}{7}$, $\frac{1}{3}$ are unlike fractions because their denominators are different.

The LCM of the denominators of the given fractions i.e. the L.C.M. of 7 and 3 is 21.

$\therefore \frac{5}{7}+\frac{1}{3}=\frac{5\times 3+7\times 1}{21}=\frac{15+7}{21}=\frac{22}{21}=1\frac{1}{21}$