What approximate value should come in place of question mark (?) in the following question?
\(\sqrt {89898} \times 2.486 = ?\)
Solution
Correct Answer: Option C
In this type of question, we are expected to calculate Approximate value (not exact value), so we can replace the given numbers by their nearest perfect places which makes the calculation easy.
We can write the given values as:
89898 ≈ 9 × 10000
2.486 ≈ 2.5
Now the given expression will be transformed as:
\(\begin{array}{l} \sqrt {89898} \times 2.486 = ?\\ \Rightarrow ? \approx \sqrt {9 \times 10000} \times 2.486 \end{array}\)
⇒ ? ≈ 3 × 100 × 2.5
⇒ ? ≈ 750
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