Question

Find the LCM: 

i. 12, 15 

ii. 6, 8, 10 

iii. 18, 32 

iv. 10, 15, 20 

v. 45, 86

Answer 1

i. 12, 15 

∴ LCM of 12 and 15 = 3 x 2 x 2 x 5 = 60

ii. 6, 8, 10 

∴ LCM of 6, 8 and 10 = 2 x 2 x 3 x 2 x 5 = 120

iii. 18, 32 

∴ LCM of 18 and 32 = 2 x 2 x 2 x 2 x 3 x 3 x 2 

= 288

iv. 10, 15, 20 

∴ LCM of 10, 15 and 20 = 5 x 2 x 3 x 2 = 60

v. 45, 86

∴ LCM of 45 and 86 = 2 x 3 x 3 x 5 x 43 

= 3870