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To find the GCF of two numbers you first need to split them into their prime factors. In this case:

63 = 3x3x7

77 = 7x11

The next step is identifying any common factors. The only common prime factor is 7. Therefore the GCF of 63 and 77 is 7.

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βˆ™ 13y ago
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Q: What is the GCF of 63 and 77?
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