The Highest Common Factor (HCF) of 225 and 63 is 9. To find the HCF, you can use the prime factorization method. First, find the prime factors of each number: 225 = 3 x 3 x 5 x 5 and 63 = 3 x 3 x 7. Then, identify the common prime factors and multiply them together to get the HCF, which in this case is 3 x 3 = 9.
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