Multiple choice Which of the following is the HCF of 594 and 1265? 9 11 13 15 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Prime factorisation of 594 = 2 × 3 × 3 × 3 × 11 Prime factorisation of 1265 = 5 × 23 × 11 HCF of 594 and 1264 = 11