Find the LCM.
i. 36, 42
∴ LCM of 36 and 42 = 2 x 3 x 2 x 3 x 7
= 252
ii. 15, 25, 30
∴ LCM of 15, 25 and 30 = 5 x 3 x 5 x 2
= 150
iii. 18, 42, 48
∴ LCM of 18,42 and 48 = 2 x 3 x 2 x 2 x 3 x 7 x 2
= 1008
iv. 4, 12, 20
∴ LCM of 4, 12 and 20 = 2 x 2 x 3 x 5
= 60
v. 24, 40, 80, 120
∴ LCM of 24, 40, 80 and 120 = 2 x 2 x 2 x 5 x 3 x 2
= 240