There is no highest common multiple. Once you get a common multiple - for example, multiplying 18 x 57, or using prime factorization to get the smallest common multiple - you can multiply it by 2, by 3, by 4, etc. and get ever-larger common multiples.
What is the lowest common denominator of 15 over 57?
The Least Common Denominator of 57 and 35 is 1.
57
456
57
The GCF/HCF of 57 and 87 is 3.The highest common factor (HCF) is 3.
least common multiple of 18 and 57 is 342.
Common factors of 57 and 93 are: 1 and 3.
The LCD for 19 and 3 is 57
1 is their Highest Common Factor or Greatest Common Divisor.
The greatest common factor of the numbers 57 and 93 is 3.
Least Common Multiple (LCM) for 18 57 is 342