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The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least denominator for a number is itself.
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The Least Common Multiple (LCM) for 70 24 is 840.
That's two different things. The common factors of 350 and 420 are 1, 2, 5, 7, 10, 14, 35, 70, with 70 being the GCF. The least common denominator of 350 and 420 is 2100.
The least common multiple of 8 and 70 is 280.