The highest common multiple of any set of integers is infinite.
The highest common multiple is infinite, and not very practical. The GCF is 3. The LCM is 84.
The highest common factor is 3.
GCF of 21 and 51 is 3.21=3*751=3*17
21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63
The least common multiple of 3, 21, and 56 is 168.
triplets
The lowest common multiple is 21
LCM is 21
The highest common multiple of two numbers is their least common multiple (LCM). The LCM of 3 and 5 is found by multiplying the two numbers and dividing by their greatest common divisor (GCD). In this case, the LCM of 3 and 5 is 15, as 3 * 5 / 1 = 15.
The least common multiple is 21.
21