8 and 5
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Well, let's paint a happy little picture with prime numbers! To find the Least Common Multiple (LCM) of 12, 28, and 40, we first break down each number into its prime factors: 12 = 2^2 * 3, 28 = 2^2 * 7, and 40 = 2^3 * 5. Then, we take the highest power of each prime factor that appears in any of the numbers, which gives us 2^3 * 3 * 5 * 7 = 840. So, the LCM of 12, 28, and 40 using prime numbers is 840.
16 and 24
You need at least two numbers to find an LCM. If that's 5 and 40, the LCM is 40.
40 and 50
To find the least common multiple (LCM) of 20, 40, and 100, we first need to find the prime factorization of each number. The prime factorization of 20 is 2^2 * 5, 40 is 2^3 * 5, and 100 is 2^2 * 5^2. To find the LCM, we take the highest power of each prime factor that appears in the factorization of any of the numbers. Therefore, the LCM of 20, 40, and 100 is 2^3 * 5^2, which equals 200.