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The sum of two real numbers is always what type of number?

Answer and explanation

Correct answer: Real number

Direct answer: Option A, a real number. Real numbers include rational numbers such as integers, fractions, and terminating or recurring decimals, as well as irrational numbers such as \(\sqrt2\) and \(\pi\). The real number system is closed under addition. This means that whenever two real numbers are added, the result is again a real number. If the numbers are \(x\) and \(y\), then \(x,y\in\mathbb R\) implies \(x+y\in\mathbb R\). Option A is correct because it states this closure property. Option B, only natural number, is wrong: for example, \(\frac12+\frac13=\frac56\), which is real but not a natural number. Option C, only irrational number, is wrong: \(2+3=5\), and 5 is rational. Option D, undefined number, is wrong because addition of real numbers is defined. Remember: real numbers are closed under addition, subtraction, and multiplication, although division needs a non-zero divisor.

Related tags

Real NumbersClass 9Closure Addition

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