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The common denominator is usually the Lowest (or Least) Common Multiple of the numbers involved. Where two numbers have no common factors then the LCM is simply the product of those numbers. As 19 is a Prime number and has no factors in common with 18 then the common denominator is 18 x 19 = 342.

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13y ago
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6y ago

If that's 1/8 and 1/3, the LCD is 24.

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11y ago

LCD(18, 13) = 234

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12y ago

36

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8y ago

57

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6y ago

114

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Q: What is the least common denominator of 18 and 13?
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