The common denominator of any two or more whole numbers, such as 187 and 136, will always be one (1) because 'common denominator' refers to the denominators of two or more fractions or mixed numbers, not whole numbers. So, a set of whole numbers (x,x) would have to be converted to their fraction equivalents, i.e., x/1, which will always yield a denominator of 1.
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multiply the denominators
You use them when there are 2 fractions with different denominators.
The common factors of 187 and 221 are 1 and 17
Every set of denominators has a common denominator, even if it's only their product.
When you're adding or subtracting fractions with different denominators, if you multiply the denominators that's your Quick Common Denominator. I'ts useful for denominators that don't have a low Least Common Factor.