Question

Using the most convenient grouping, find the product : $5\times 648\times 20$

Answer 1

Evaluating the expresion using grouping

The given expression is $5\times 648\times 20$

Here, grouping $20\times 5$ will give us $100$ and will be convient to evaluate the expression.

Therefore,

$\begin{array}{rcl}5\times 648\times 20& =& (5\times 20)\times 648\\ & =& 100\times 648\\ & =& 64800\end{array}$

Hence, $5\times 648\times 20=64800$