The common factors of 504 and 720 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.
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240
504 9*56 = 504 8*63 = 504
To have a highest common factor you need to have more than 1 number other wise you carn't compare the sets of factors as there will only be 1 set of factors.
7
The Highest Common Factor (HCF) of two numbers is the largest positive integer that divides both numbers without leaving a remainder. To find the HCF of 210 and 504, you can use the Euclidean algorithm or prime factorization method. In this case, the prime factorization of 210 is 2 x 3 x 5 x 7, and the prime factorization of 504 is 2^3 x 3^2 x 7. To find the HCF, you take the common prime factors with the lowest exponents, which are 2 x 3 x 7 = 42. Therefore, the HCF of 210 and 504 is 42.