All those numbers are mutually prime (5 and 7 are prime, full stop), so the least common denominator is 5x7x8x9.
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The LCD of 5/8 and 7/12 is 24.
The common denominator of 5/8 and 3/4 is 32.The lowest common denominator (LCD) is 8.The highest common denominator (HCD) is 32.
A common denominator, though not the least, is 63000.
24
All integers when written as fractions are simply the integer over one. Thus the lowest common denominator is one.