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Class 10MathematicsReal NumbersDecimal expansion of rational numbersHardLevel 20
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If (\frac{p}{q}) is in lowest form and the decimal terminates exactly after (3) places, which of these cannot be (q)?

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Answer and explanation

Correct answer: (25)

Step 1: For exactly (3) places, the larger exponent of (2) or (5) in the reduced denominator must be (3). Step 2: (8=2^3), (40=2^3\cdot 5), and (125=5^3) satisfy this. (25=5^2) gives only (2) places. Step 3: Understand the difference between exactly and at most.

Related tags

Exact-Decimal-PlacesDenominatorTerminating-DecimalHard

Frequently asked questions

What is the correct answer to this question?

(25)

Why is this the correct answer?

Step 1: For exactly (3) places, the larger exponent of (2) or (5) in the reduced denominator must be (3). Step 2: (8=2^3), (40=2^3\cdot 5), and (125=5^3) satisfy this. (25=5^2) gives only (2) places. Step 3: Understand the difference between exactly and at most.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Decimal expansion of rational numbers.

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10 more MCQs
  1. 1What type of decimal expansion will the rational number (\frac{3}{8}) have?
  2. 2What type of decimal expansion does (\frac{5}{6}) have?
  3. 3Under what condition does (\frac{p}{q}) have a terminating decimal expansion when the fraction is in lowest form?
  4. 4After reducing (\frac{15}{40}), what type of decimal expansion will it have?
  5. 5After at most how many decimal places will the decimal expansion of (\frac{7}{16}) terminate?
  6. 6Choose the correct statement about the decimal expansion of (\frac{11}{45}).
  7. 7Which of the following fractions will give a terminating decimal?
  8. 8Which of the following fractions will give a non-terminating recurring decimal?
  9. 9When (0.75) is written as a rational number, which form is obtained?
  10. 10If the denominator of a fraction in lowest form is (2^3\times5^2), after at most how many decimal places will its decimal expansion terminate?
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