the hcf of 45 and 105 is 15 . write their lcm . Share with your friends Share 4 Varun.Rawat answered this We know that ,HCF × LCM = product of 2 numbersso, 15 × LCM = 45 × 105LCM = 45 × 10515 = 105 × 3 = 315 21 View Full Answer