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The factors of 16 are:

1, 2, 4, 8, 16

The factors of 18 are:

1, 2, 3, 6, 9, 18

The factors of 42 are:

1, 2, 3, 6, 7, 14, 21, 42

The common factors are:

1, 2

The Greatest Common Factor (GCF) is:

2

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Q: What is the GCF of 18 42 and 16?
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What is the greatest common factor of 18 42 and 16?

The GCF is 2.


What is the gcf of 42 and 18 also 42 and 56?

The GCF of 18 and 42 is 6. The GCF of 42 and 56 is 14.


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The GCF of 1218 and 42 is 42. The GCF of 12, 18 and 42 is 6.


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GCF of 21 and 42: 21GCF of 16 and 25: 1


Can the GCF of 16 and 42 be less than 16 Explain?

yes... 16 is not a factor of 42 GCF is 2


What if the GCF of 42 and 18?

The GCF is 6.


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The greatest common factor of 18, 30, and 42 is 2.


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Since 16 is not a factor of 42, the GCF in this case has to be less than 16.