Sixths and ninths.
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The least common denominator is the least common multiple of the denominators of the fractions.
A common denominator is needed when adding or subtracting fractions of different denominators.
They are essentially the same. A common denominator is the common multiple of a set of denominators of a set of fractions.
If you are adding or subtracting unlike fractions, convert them to equivalent fractions with a common denominator.
Convert them to improper fractions with a common denominator.