Twenty of them including 80 and 100
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Three numbers.
144, 121 and 100
When they have a factor in common greater than one.
Common factors are normally applicable only to 2 or more whole numbers which do not include decimal numbers.
The common denominator of any two or more whole numbers, such as 100 and 150, 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.