You need at least two numbers to find something in common between them.
The Least Common Denominator of 57 and 35 is 1.
Least common denominator of 7 and 5 is 35.
The Least Common Denominator of 5, 7, and 35 is 1.
35 is.
A common denominator, though not the least, is 1680.
The least common denominator is 70.
35
105 is.
210
Their product.
The factors of 35 are 1, 5, 7, and 35. In order to find a common denominator, you would need another number for it to be in common with.
LCM(815, 35) = 5705.