\(\sqrt{1225.4}\times3.98\) + 17.9% of 600 is approximately equal to:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 245
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.
\(1225.4\approx1225=35^{2}\), so \(\sqrt{1225.4}\approx35\)
\(3.98\approx4\), so \(35\times4=140\)
17.9% of 600 \(\approx\) 18% of 600 \(\displaystyle=\frac{18}{100}\times600=108\)
\(140+108=248\), and the nearest option is 245