Multiple choice

Which of the following numbers is the highest common factor of 51 and 18?

  1. 2

  2. 3

  3. 7

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Factors of 51 = 3 × 17 Factors of 18 = 3 × 2 × 3 HCF of 51 and 81 = 3 

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