Because it is the lowest multiple that 18 and 20 have in common
18 = 2x3x3 20 = 2x2x5 lcm = 2x2x3x3x5 = 18x10=180
LCM(20, 10, 18) = 180.
The LCM is: 180
The LCM of 10, 18, and 20 is 180.
The LCM is 180.
The LCM of 18 and 20 is 180 Using factorisation method: 18 = 2 x 3² 20 = 2² x 5 lcm = 2² x 3² x 5 = 180
The lcm is 180
180
180
180
180
It is 180