HCF stands for the Highest Common Factor. To determine this, you find the highest number possible that can be divide each of the two numbers in a fraction.
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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.
List the prime factors of each. 18 = 2 x 3 x 3, 42 = 2 x 3 x 7 Common factors are 2 and 3 so HCF = 6.
The HCF is 7.
The HCF is: 2
The HCF is 1.