Question

Estimate $5679-422$ by rounding off each number to its greatest place.

• A. $5257$
• B. $5300$
• C. $5400$
• D. $5200$

Answer 1

Answer: (B)

$5300$

$\Rightarrow$ The given two numbers are $5679$ and $422$.

$\Rightarrow$ In number $5679$, its tens digit is $7$, which is greater than $5$.

$\Rightarrow$ So, we increase the digits at hundreds place by $1$ and replace each one of the digits at tens and ones place by $0$ to round off the given number to its greatest place.

$\therefore$ Round off 5679 to its greatest place is $5700$

$\Rightarrow$ In number $422$, its Itens digit is 2, which is less than 5.

$\Rightarrow$ So, we replace each of the tens and ones digits by 0 and keep the other digits as they are to round off the given number to its greatest.

$\therefore$ Round off 422 to its greatest place is $400$

$\therefore$ Required number = $5700-400=5300$