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The sum of two rational numbers is always what?

Answer and explanation

Correct answer: A rational number

The governing concept is the closure of rational numbers under addition. Let the two rational numbers be a/b and c/d, where a, b, c and d are integers and b and d are non-zero. Their sum is a/b + c/d = (ad + bc)/bd. The numerator ad + bc is an integer, and the denominator bd is a non-zero integer, so the result is again of the form of an integer divided by a non-zero integer. Hence it is rational, making option B correct. The sum is not necessarily irrational, natural or zero. For example, 1/2 + 1/3 = 5/6, which is rational but is neither a natural number nor zero. This confirms the general closure property.

Related tags

Rational NumbersClosure PropertyAdditionNumber SystemsMathematicsClass 9 Mcq

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