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How will (5.232323...) be classified as a real number?

Answer and explanation

Correct answer: Rational real number

Direct answer: option B, rational real number. A real number is rational if it can be written as a fraction of integers. A decimal that repeats forever in a fixed block is always rational. Here 23 repeats: \(5.232323\ldots=5.\overline{23}\). Therefore it can be converted into a fraction, so it is rational. Option A is wrong because an irrational decimal neither terminates nor repeats regularly. Option B is correct because this decimal repeats regularly. Option C is wrong because an integer has no nonzero decimal part; this number lies between 5 and 6. Option D is wrong because the expression is defined and has a clear decimal value. Exam cue: terminating or recurring decimal means rational; non-terminating non-recurring means irrational.

Related tags

Real NumbersRepeating DecimalRational

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