Question

Simplify $\frac{21}{63}\times 3+\frac{9}{3}.$

Answer 1

As per the PEMDAS rule, multiplication has a higher priority than addition.

$\frac{21}{63}\times 3+\frac{9}{3}$
$=\frac{21}{3\times 21}\times 3+\frac{9}{3}$
(cancelling $3$ and $21$ from numerator and denominator)

$=1+\frac{3\times 3}{3}$
(cancelling $3$ from numerator and denominator)

$=1+3$
$=4$