The easiest method is the prime factor method. If you decide to list the multiples of each and pick the least, itsgoing to be cumbersome. Thus you have to list so many before reaching the common multiple in each. Prime factors of 16
Prime factors of 16=2×2×2×2 Prime factors of 16=24 Prime factors of 30
Prime factors of 30=2×3×5 Prime factors of 36
Prime factors of 16=2×2×3×3 Prime factors of 16=22×32 The list common multiple is the product (multiplication) of each of the prime factors in their highest powers L.C.M of 16,30 and 36=24×32×5 L.C.M of 16,30 and 36=16×9×5 L.C.M of 16,30 and 36=720