The LCM is: 320
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The least common multiple of the numbers 32, 40 and 64 is 320.
The least common multiple (LCM) of 64 and 120 in 1,260.
The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 4 and 8 is 8. (See related question "What is the greatest common factor of 4 and 8?" for this calculation.) So, the least common multiple is 4 x 8 ÷ 4 = 8. Common multiples of 4 and 8 include 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, etc. Although 16 is a common multiple, it is not the least common multiple.
The Greatest Common Factor (GCF) of 64, 40, and 16 is 8.
The GCF of 40, 56, and 64 is 8.