The common denominator of any two or more whole numbers will always be 1.
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72
72
For 17 and 18: 306 For 1/7 and 1/8: 56
The lowest common multiple, or lowest common denominator, of 18 and 28 is 252.
If that's 8 and 1/8 and 16 and 1/4, the LCD is 8.