Multiple choice

Which of the following numbers is the highest common factor of 27 and 90?

  1. 3

  2. 6

  3. 9

  4. 18
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Factors of 27 = 3 × 3 × 3 Factors of 9 = 3 × 3 HCF of 27 and 9 = 9

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