L.C.M. of 8, 16, 40 and 80 = 80. 7 = 70 ;   13 = 65 ;   31 = 62 8 80 16 80 40 80 Since, 70 > 65 > 63 > 62 , so 7 > 13 > 63 > 31 80 80 80 80 8 16 80 40 So, 7 is the largest. 8