Question

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

$3239\times 28$

Answer 1

Given, product is $3239\times 28$.

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,

$$\begin{gathered} 3239\to 3240 \\ 28\to 30 \\ 3239\times 28\to 3240\times 30 \\ =97200 \end{gathered}$$

Hence, the required round off is $3239\times 28=97200$.