The common denominator of any two or more whole numbers, such as 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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The LCD of 3, 4 and 5 is 60.
The lowest common denominator of any set of whole numbers is 1
1 is the only common denominator.
First you need a common denominator: 3/4 and 5/8, the common denominator is 8. (4x2=8, 8x1=8) Multiply both the numerator and denominator of 3/4 by 2 so that it becomes 6/8. Now that a common denominator is established, you may subtract them with ease. 6/8 - 5/8 = 1/8.
To compare fractions, we need to have a common denominator. In this case, the common denominator for 9, 4, and 12 is 36. Converting the fractions to have a denominator of 36, we get 20/36, 27/36, and 21/36. Therefore, in order from least to greatest: 5/9, 7/12, 3/4.