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To calculate the LCM, you first have to split the numbers up into their prime factors:

64 = 2x2x2x2x2x2

72 = 2x2x2x3x3

The next step is to calculate the HCF. In this case it will be 2x2x2 = 8. Finally, you multiply the two numbers and divide by the HCF:

64x72/8 = 576

And therefore the LCM of 64 and 72 is 576.

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∙ 14y ago

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