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The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 25 are:1, 5, 25The factors of 57 are:1, 3, 19, 57The common factors are:1The Greatest Common Factor:GCF = 1
The common factors are: 1, 19
The factors of 19 are: 1, 19 The factors of 76 are: 1, 2, 4, 19, 38, 76 The common factors are: 1, 19 The Greatest Common Factor: 19
The factors of 57 are 1, 3, 19, and 57The factors of 18 are 1, 2, 3, 6, 9, and 18
The common denominator is usually the Lowest (or Least) Common Multiple of the numbers involved. Where two numbers have no common factors then the LCM is simply the product of those numbers. As 19 is a prime number and has no factors in common with 18 then the common denominator is 18 x 19 = 342.