Question

Estimate the following product by rounding off each number to nearest tens :

$87\times 32$

Answer 1

Given, product is $87\times 32$.

For rounding off to nearest tens,we first check the digit at one's place.If the digit at one's place is less than $5$ then we replace it by zero but the digit at one's place is $\ge 5$ then we add $1$ to ten's place digit and replace one's place by zero.

We have,

$$\begin{gathered} 87\to 90 \\ 32\to 30 \\ 87\times 32\to 90\times 30 \\ =2700 \end{gathered}$$

Hence, the required round off is $87\times 32\to 2700$.