How to find HCF? Math sample questions - Number theory - HCF, LCM, GCD : Ascent Education - MBA Entrance training

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You are here: Home   XAT, TANCET Prep Questions  Number Theory   LCM, HCF, GCD Question 9

How to find HCF / GCD of numbers?

The question is from the topic Number Systems and Number Theory. It is about finding the GCD (Greatest Common Divisor) or HCF (Highest Common Factor) of two numbers.


Find the G.C.D of 12x2y3z2, 18x3y2z4, and 24xy4z3.
  1. 6xy2z2
  2. 6x3y4z3
  3. 24xy2z2
  4. 24xy3z2
  5. 18x2y2z3
Correct Answer - 6xy2z2. Choice (1)

Explanatory Answer

G.C.D of 12, 18 and 24 is 6.

Greatest common divisor or highest common factor is found by listing down factors common to all numbers in their respective lowest power and multiplying them.

The factors common to all three numbers are x, y, z and their lowest power amongst all numbers are 1, 2 and 2 respectively.

Therefore, G.C.D = 6xy2z2

Correct answer choice (1)

Level of difficulty : Easy to Moderate

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