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What is the standard form of -9/12?

Answer and explanation

Correct answer: -3/4

The governing concept is the standard form of a rational number. In standard form, the denominator must be positive and the numerator and denominator must have no common factor other than 1. Starting with -9/12, the greatest common divisor of 9 and 12 is 3. Dividing both numerator and denominator by 3 gives -9/12 = -3/4. The denominator 4 is positive, and 3 and 4 are coprime, so option A is correct. Option B has the same numerical value but leaves the denominator negative, so it is not the standard form. Option C is not obtained by reducing the fraction, and option D changes the sign and is not equivalent to the original negative fraction.

Related tags

Number SystemsRational NumbersStandard FormMathematicsClass 9 Mcq

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