Multiple choice Find the H.C.F. of 36 and 9. 2 3 4 9 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Factors of 36 = 2 x 2 x 3 x 3 Factors of 9 = 3 x 3 HCF of 36 & 9 = 3 x 3 = 9