56
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
The LCM is: 168
8
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, ...
The LCM is 8
24
The answer that I got was 24, and any multiples of 24.
The LCM is: 88
The Least Common Multiple (LCM) for 8 10 15 is 120.
The lowest common multiple is 24
24
Least Common Multiple (LCM) for 8 9 is 72.