The common factors of 280 and 8 are: 1, 2, 4, and 8
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The common factors of 40 and 56 are: 1, 2, 4, and 8
The least common multiple of 10, 8, and 7 is 280.
lcd = lowest common denominator. are these denominators of fractions, if so the lcd (since they have no common factors) is 8x35 = 280 if you mean lowest common divisor then the answer is 1
All common multiples of 7, 10 and 8 are divisible by them. The lowest common multiple of them is 280, so all multiples of 280 are divisible by them, namely 280, 560, 840, 1120, ...
280