Question

Find the product of the following using some quicker grouping

$15635\times 99-(-15635)$

Answer 1

Finding the product

Given expression is $15635\times 99-(-15635)$

$\Rightarrow$$15635\times 99-(-15635)$$=$$15635\times 99+15635$

we can take $15635$ as common,

$\begin{array}{rcl}15635\times 99+15635& =& 15635(99+1)\\ & =& 15635\times 100\\ & =& 1563500\end{array}$

Hence, $15635\times 99-(-15635)=1563500$