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If \(a=\sqrt{75}\), then which of the following values is \(a-8\) closest to on the number line?

Answer and explanation

Correct answer: 0.66

Since \(\sqrt{75}=5\sqrt{3}\approx5\times1.732=8.66\), we get \(a-8\approx8.66-8=0.66\). Therefore, option B is correct. Values such as 0.36 or 0.06 may result from errors in estimating the square root or subtracting the integer. Exam tip: estimate the square root first and then perform the subtraction.

Related tags

Number LineSquare Root EstimationIrrational NumbersDecimal ApproximationRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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