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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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