3, 7, 9, 21, 63 and 1, 3, 9, 27, 81 respectively. There are 3 commonly used methods to find the GCF of 63 and 81 - Euclidean algorithm, long division, and prime factorization.
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Some of them are child's play, while others are more complex. It's worth knowing all of them so you can decide which you prefer: Using the list of factors; Prime factorization of numbers; Euclidean algorithm; Binary algorithm (Stein's algorithm); and Using multiple properties of GCF (...