Question

Estimate the following product using general rule:
$5281\times 3491$

Answer 1

Using the general rule, we will round off the factors to their greatest place.

Here each number being a 4-digit number, we will round them off to the nearest thousands.

$5281$ rounds off to $5000$ and $3491$ rounds off to $3000$.

Therefore, $5281\times 3491$ can be estimated as:
$5000\times 3000$
$=1,50,00,000$

Note: There are multiple answers possible depending on your estimation to the nearest tens, hundreds or thousands. The estimate which is closest to the actual answer is the most meaningful answer.