LCM of given numbers is found using their prime factorization and then taking the highest power of each prime factor. Calculation: Prime factorization: ‌56=23×7 ‌30=2×3×5 ‌108=22×33 ‌120=23×3×5 ‌LCM=23×33×5×7 ‌⇒LCM=8×27×5×7 ‌⇒LCM=216×5×7 ‌⇒LCM=1080×7 ‌⇒LCM=7560