To find LCM of 24 and 36 we can use prime factorisation method.
Prime factorisation of 24 = 2 x 2 x 2 x 3
Prime factorisation of 36 = 2 x 2 x 3 x 3
Multiply each factor the maximum number of times it occurs in either number.
2 occurred three times and 3 occurred two times
Therefore, LCM (24,36) = 2 x 2 x 2 x 3 x 3 = 72