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Q: Is the greatest common factor of two composite numbers is sometimes one?

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?

Not necessarily. The GCF of 6 and 9 is 3.

Not necessarily.

4 and 9

25 and 36

15 and 16

8 and 16

24, 25 and 26

8 and 16

25, 36, 49

8 and 16

No.

Composite. All whole numbers ending in zero are composite.

All numbers have a common factor of 1. Sometimes that's the only common factor.

8 and 16, among others.

25 and 32

Sometimes two numbers have no other factors in common.

If the GCF of two composite numbers is 1, they are co-prime or relatively prime.

Yes as for example 34 and 45

There is no standard GCF in that instance. It varies according to which numbers you select.

Sometimes 2.

It happens because one is the only factor the two numbers have in common.

4 and 24, 12 and 16

Because they have no other common factors that are greater.

No. Two composite numbers, like 4 and 9, can have a GCF of 1. They are said to be relatively prime or co-prime.