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Class 10MathematicsReal NumbersDecimal expansion of rational numbersMediumLevel 19
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By which number should (\frac{5}{18}) be multiplied so that the resulting fraction has a terminating decimal expansion?

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Answer and explanation

Correct answer: (3)

Step 1: (18=2\times3^2), so (3^2) in the denominator is the obstacle. Step 2: Multiplying by (3) gives (\frac{15}{18}=\frac{5}{6}), which still does not terminate. Step 3: Exam tip: The correct least multiplier should be (9), so none of the given options is suitable.

Related tags

Least-MultiplierOption-AuditRecurring-Decimal

Frequently asked questions

What is the correct answer to this question?

(3)

Why is this the correct answer?

Step 1: (18=2\times3^2), so (3^2) in the denominator is the obstacle. Step 2: Multiplying by (3) gives (\frac{15}{18}=\frac{5}{6}), which still does not terminate. Step 3: Exam tip: The correct least multiplier should be (9), so none of the given options is suitable.

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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