19440, 38880, 58320 and so on.
240
The common multiples of 10 and 16 are 80, 160, 240 and so on.
The common multiples of 3 and 16 are all multiples of their LCM, which is 48. Thus, their common multiples are 48, 96, 144, 192, 240, 288, etc.
240, 480, 720
486, 972, 1458, 1944, and all of the other multiples of 486 are divisible by 486.
The multiples of 16 are 16, 32, 48, 64, 80, etc. The multiples of 20 are 20, 40, 60, 80, 100, etc. The common multiples of 16 and 20 are 80, 160, 240 and so on.
96, 144, 192, 240, etc.
120, 240, 360 and so on.
120, 240, 360 and so on.
60, 120, 180, 240
240, 480 and 720
The word "GREATEST" is a superlative adjective and that means there can be only one.GCF(240, 486) = 6.