Question

Estimate the products:

$21\times 29$

Answer 1

To estimate the product, we first round off the multiplier and the multiplicand to the nearest tens and then multiply the rounded numbers.

Given: $21\times 29$

So, $21$ is rounded down to $20$ and $29$ is rounded up to $30$

$\Rightarrow 20\times 30$

$=600$

Hence, the estimated product is $600$.