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To find the GCF of 18 and 10 you have to split them into their prime factors:

18 = 2x3x3

10 = 2x5

Next you have to identify any common prime factors. In this case both numbers have a 2 as a prime factor. Therefore, the GCF of 18 and 10 is 2.

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Q: What is the GCF of 18 and 10?
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