What are the lcm and hcf of 120, 160, 180. plz give the orders

So,

To find the LCM, factor each number and then combine the factors.
P.F.F. of 120: 
P.F.F. of 160: 
P.F.F. of 180: 

Combining them (and omitting overlaps) we get: 

The LCM of 120, 160, and 180 is 1440.

To find the HCF, factor (again) and find the common factors.
P.F.F. of 120: 
P.F.F. of 160: 
P.F.F. of 180: 

Finding common factors: 

The HCF of 120, 160, and 180 is 20.