Question

Multiply:

vi) $\frac{-11}{13}$ by $\frac{-21}{7}$

Answer 1

To multiply:

$\frac{-11}{13}$ by $\frac{-21}{7}$

$=\frac{-11}{13}\times \frac{-21}{7}$

$=\frac{-11\times (-21)}{13\times 7}$ $(\because \frac{a}{b}\times \frac{c}{d}=\frac{a\times c}{b\times d})$

$=\frac{231}{91}$

$=\frac{33}{13}$

Hence, the required product is $\frac{33}{13}$ .