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Which option has a terminating decimal expansion?

Answer and explanation

Correct answer: 7/16

Answer: D, 7/16. A rational number written in lowest terms has a terminating decimal expansion only when the prime factors of its denominator are 2, 5, or both. The fraction 7/16 is already in lowest terms, and 16 = 2⁴, so it terminates: 7 ÷ 16 = 0.4375. Option A, √2, is irrational, so its decimal expansion is non-terminating and non-repeating. Option B, π, is also irrational; its decimal expansion does not terminate. Option C, √3, is irrational for the same relevant reason and does not have a terminating decimal expansion. The earlier forms involving an expression divided by itself were ambiguous because each could simplify to 1, so they have been removed. Memory cue: for a reduced fraction, inspect the denominator only—2s and 5s mean terminating; any other prime factor means non-terminating repeating.

Related tags

Decimal RepresentationRational NumbersIrrational NumbersNumber SystemsMathematicsClass 9 Mcq

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