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What is the multiplicative inverse of -4/9?

Answer and explanation

Correct answer: -9/4

The governing concept is the multiplicative inverse, or reciprocal, of a nonzero rational number. The multiplicative inverse of a/b is b/a, provided a is not zero, because their product must equal 1. For -4/9, interchange the numerator and denominator while retaining the negative sign: the inverse is -9/4. Verification gives (-4/9) × (-9/4) = 36/36 = 1, so option B is correct. Option A loses the negative sign and its product with -4/9 is -1. Option C is the original number, not its inverse. Option D is equivalent to 4/9 because both signs are negative, so it also loses the required negative sign. The sign and reciprocal operation must both be handled correctly.

Related tags

Number SystemsRational NumbersMultiplicative InverseMathematicsClass 9 Mcq

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