4536
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Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
LCD(9, 16, 18, 81) = 1296
common denominator of eight and nine
8100
The least common denominator of 8 and 9 is found by finding the multiples of each number so: Multiples of 8 = 8, 16, 24, 32, 40, 48, 56, 64, 72, 80 Multiples of 9 = 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 Now look at your results and find the smallest number that is the same. 72 is the lowest, so that's is the least common denominator of 8 and 9