3
The Greatest Common Divisor (GCD) for 21 12 is 3.
The Greatest Common Factor of 12, 36, 21 is 3.
21 is the LCM, but multiples go on forever, so there is no upper limit, or greatest common multiple.
If you want the "greatest", then there can only be one of it.You can't have two different numbers and say that they'reboth the "greatest".The greatest common factor of 12 and 21 is 3 .
The highest common factor of the numbers 12 and 21 is 3.
84, 168, 252
The GCF of 12, 21, and 88 is 1.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
This cannot be answered because the common multiples of any two or more numbers are infinite.
This cannot be determined because the common multiples of any two or more numbers are infinite.
It is: 3
The GCF is 3.