Question

Estimate the following product using general rule:
1291 × 592

Answer 1

Rule: Round off each number involved in the operation to its greatest place(nearest hundred), then multiply the rounded off numbers.

1,291 × 592
1,291 round off to nearest 100 $\Rightarrow$ 1,300
592 round off to nearest 100 $\Rightarrow$ 600
$\therefore$The estimated product = 1,300 × 600 = 7,80,000