To work out the LCM, you need two numbers. You have provided only one so you can't work out the LCM.
LCM of two numbers = their product divided by their HCF. The HCF of 64 and 610 is only 2 so the LCM is 64 x 610/2 ie 19520.
The LCM of one number is itself.
1220
You need at least two numbers to find an LCM. If that's 6 and 10, the LCM is 30.
The LCM of the given two numbers is 3660
The Least Common Multiple (LCM) of (610,15) is 1830.
610
20% of 610 = 20% * 610 = 0.2 * 610 = 122
610
610 is.
610
DCX (500+100+10 = 610)