Question

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

$311\times 113$

Answer 1

Given, the product is $311\times 113$.

For rounding off to the 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,

$$\begin{gathered} 311\to 310 \\ 113\to 110 \\ 311\times 113\to 310\times 110 \\ =34100 \end{gathered}$$

Hence, the required round off is $311\times 113\to 34100$.