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The decimal expansion of \(\frac{7}{2^2\times5^3}\) will terminate after how many decimal places?

Answer and explanation

Correct answer: 3

The denominator is \(2^2\times5^3=500\). Converting it to a power-of-10 denominator gives \(\frac{7}{500}=\frac{14}{1000}=0.014\). Thus, there are three digits after the decimal point, so the expansion terminates after 3 decimal places. Option 2 is incorrect because \(0.014\) has three, not two, digits after the decimal point. Exam tip: if a denominator has only factors 2 and 5, the larger of their exponents gives the required number of decimal places.

Related tags

Number SystemsTerminating DecimalsDecimal RepresentationRational NumbersPowers Of 2 And 5MathematicsClass 9 Mcq

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