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First factor each of the 3 numbers into primes:
8= 2 x 2 x 2
12 = 2 x 2 x 3
24 = 2 x 2 x 2 x 3
Next, determine what set of factors is common to all:
2 x 2 fits the bill.
The highest common factor of a set of numbers is the multiple of the prime factors common to all, so 2 x 2 = 4 is the HCF of 8, 12, 24.
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What is the HCF of 15 and 24?
The Highest Common Factor (HCF) of 15 and 24 is 3. To find the HCF, you can list the factors of each number and identify the largest factor they have in common. The factors of 15 are 1, 3, 5, and 15. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The largest factor they have in common is 3, making it the HCF.
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