Question

(Find the L.C.M. of the following Numbers.)
(b) 15, 18​

Answer 1

Answer:

Multiply the factors to get the LCM. The LCM of 15 and 18 is 90.

Answer 2

NOTE : To find the LCM of two or more numbers we need to list the prime factorization of the numbers, then multiply each factor the greatest number of times it occurs in either number. If the same factor occurs more than once in both numbers, you multiply the factor the greatest number of times it occurs.

then multiply each factor the greatest number of times it occurs in either number. If the same factor occurs more than once in both numbers, you multiply the factor the greatest number of times it occurs.

b) 15, 18

=Prime factorization of 15 = 3×5

=Prime factorization of 18 = 2×3×3

=5×3×3×2 = 90

(here) 3 is mostly found in 18, so we don't count the 3 of 15.

So, LCM is 90.