Multiple choice

Which of the following sets of the numbers has the highest common factor equal to 18?

  1. 38, 58, 124

  2. 36, 54, 126

  3. 28, 54, 126

  4. 36, 54, 128
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

36, 54, 126 Prime factorisation of 36 = 2 × 2 × 3 × 3 Prime factorisation of 54 = 2 × 3 × 3 × 3 Prime factorisation of 126 = 2 × 3 × 3 × 7 HCF = 2 × 3 × 3 = 18

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