The HCF is: 2
The LCM is: 2,520
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The LCM is 2520.
The LCM is: 2,520
The LCM is: 2,520
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.
hcf = 42, lcm = 84.