Find the lcm of 15 and 18Solutionfirst we need to factor 15

Find the l.c.m. of 15 and 18

Solution

first we need to factor 15 and 18:

We know tha:

15 = 3*5

18 = 2*3*3

To calculate the L.C.M, we will multiply all uncommon elements and the heighest power of the common element.

Then the L.C.M = (3*3) *2 *5 = 90

==> L.C.M (15, 18) = 90

To check:

90 = 15 * 6

90 = 18 * 5