Question

Estimate the product using general rule : $673\times 172$

Answer 1

Estimation of product

By general rule

$673$is rounded off to $700$

$172$is rounded off to $200$

Estimated product $=700\times 200$

$$\begin{gathered} =7\times 100\times 2\times 100 \\ =14\times 10000 \\ =14000 \end{gathered}$$

Hence , estimated product is $140000$.