Question

Estimate the following product using general rule:
5281 x 3491

Answer 1

Rule: Round off each factor to its nearest thousand, then multiply the rounded off factors.
5281 x 3491
5281 round off to nearest 1000 $\Rightarrow$ 5,000
3491 round off to nearest 1000 $\Rightarrow$ 3,000
$\therefore$ The estimated product = 5,000 x 3,000 = 1,50,00,000