LCD(10, 20) = 20
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A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.
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.
A common denominator, though the least, is 260.
20 is.