LCM of multiple numbers is the smallest number that is divisible by each of the numbers. Calculation: Prime factorization: ‌28=22×7 ‌60=22×3×5 ‌120=23×3×5 ‌135=33×5 ‌‌ LCM ‌=‌ Highest power of all primes ‌ ‌⇒‌ LCM ‌=23×33×5×7 ‌⇒‌ LCM ‌=8×27×5×7 ‌⇒‌ LCM ‌=7560