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The least common denominator is 144. Other common denominators would be multiples of 144. If that's 1/2, 1/6 and 1/8, the LCD is 24.
The lowest common denominator of 12 and 256 is 1.
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It means find the LCM of the denominators. In order to add and subtract fractions with unlike denominators, it is necessary to convert them to equivalent fractions with a common denominator. Example: 1/4 + 1/6 The LCM of 4 and 6 is 12. 1/4 = 3/12 1/6 = 2/12