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What is the correct statement about the decimal form of ( \frac{21}{80} )?

Answer and explanation

Correct answer: It is terminating

A rational number has a terminating decimal when, after reducing the fraction, the denominator has no prime factors other than 2 and 5. This happens because powers of 2 and 5 can be multiplied to make a power of 10. Therefore the decimal form in this question ends after a finite number of digits, so option A is correct. It is not irrational or undefined.

Here, the denominator is 80, and the factorisation is \(80=2^4\times5\). The numerator 21 has no common factor with 80, so the fraction is already in simplest form. Since its denominator contains only 2 and 5, \(21/80=0.2625\), which terminates. Thus the correct statement is that it is a terminating decimal.

Related tags

Real NumbersTerminating DecimalDenominator

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