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20 is the lowest common denominator for 4 and 10.
The common denominator of any two or more whole numbers, such as 10 20 5 25 40 and 4, 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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A common denominator between 4 and 10 is the lowest common multiple of the two numbers, which is 20. In fractions, the denominator represents the total number of equal parts into which a whole is divided. To add or subtract fractions with different denominators, they must first be converted to have a common denominator, such as 20 in this case.
To subtract fractions, you need to find a common denominator. The common denominator for 10 and 4 is 20. So, rewriting the fractions with a denominator of 20, we get 6/20 - 5/20 which equals 1/20.