Question

On estimating each number to the nearest 10, we get $\frac{57.2\times 110}{21.26\times 46.9}=$

• A. 6.1
• B. 6.5
• C. 6.6
• D. 6.9

Answer 1

The correct option is C 6.6

First, we round $57.2$ to the nearest 10 as unit's place digit of the number $7>5$ so, $57.2\approx 60$

Similarly, $21.26\approx 20$ as $1<5$

Now, $46.9\approx 50$ as $6>5$

$\frac{57.2\times 110}{21.26\times 46.9}\approx$ $\frac{60\times 110}{20\times 50}$

$=\frac{3\times 110}{50}=\frac{33}{5}=6.6$