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1 is the GCF of 4, 9 and 18. 4 and 9 between them have not got a common factor aside from 1. This dictates that 1 is the GCF.

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11y ago

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There are no common factors between 10, 9 and 18 aside from 1. You can tell this straight away as 10 and 9 differ by just 1. Thus the GCF is 1.

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11y ago
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The greatest common factor of 9, 18 and 38 is 1.

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9y ago
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Q: What is the gcf of 4 9 and 18?
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