Question

Estimate the following using the general rule :$730+998$

Answer 1

Given sum is $730+998$.

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

Using general rule,

$\begin{array}{rcl}730& \to & 700\\ 998& \to & 1000\\ So,730+998& =& 700+1000\\ & =& 1700\end{array}$

Hence, using the general rule :$730+998\to 1700$.