Question

Estimate $384+236$

Answer 1

Step 1: Rounding off $384$ and $236$ to nearest hundred.

We know that to round off a number nearest to hundred, we check the digit at tens place.

If it is less than $5$, we consider the unit and tens digit to be $0.$And if it is $5$ or more than $5$, we add $1$ to the digit at hundred place and ones and tens place becomes $0$.

So, in $384$, the digit at tens place is $8\text{i.e}$ more than $5$.

$\therefore$$384$ becomes $400$ after rounding off.

Similarly, in $236$, the digit at tens place is $3\text{i.e}$ less than $5$.

$\therefore$$236$ becomes $200$ after rounding off.

Step 2: Estimating $384+236$

Estimated value of $384$ is $400$ and $236$ is $200$

So, estimated value of $384+236$$=400+200$

$=600$

Hence, estimated value of $384+236$ is $600$