The common denominator of any two or more whole numbers, such as 2 3 4 and 5, 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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You can use any common multiple of 2 and 4. The easiest (for subsequent calculations) to use is the lowest common multiple, which for 2 and 4 is 4. → 1/2 = 2/4 → 3/4 = 3/4 (it already has 4 in the denominator)
2/3 and 3/4 Least Common Denominator is 12
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What would be the ideal Common Denominator for 2 and 4?
3 - 4-1/2 = 6/2 - 9/2 common denominator would be 2.