\(\sqrt{840.8}\times6.02\) + 29.9% of 450 is approximately equal to:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 310
For an approximate value, round each number to the nearest easy value: a number close to a perfect square under the root, and percentages to a whole number.
\(840.8\approx841=29^{2}\), so \(\sqrt{840.8}\approx29\)
\(6.02\approx6\), so \(29\times6=174\)
29.9% of 450 \(\approx\) 30% of 450 \(\displaystyle=\frac{30}{100}\times450=135\)
\(174+135=309\), and the nearest option is 310