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Q: When is the GCF of two numbers one of the two numbers?

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No; two numbers can have only 1 GCF.

When you are trying to find the GCF of two numbers and one of the numbers is a multiple of the other, the GCF will be the smaller of the two numbers. The GCF of 3 and 9 is 3.

When one of the numbers is a factor of the other.

If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.

You need at least two numbers to find a GCF.

You can only have one GCF and you need at least two numbers to find it.Two numbers with a GCF of 850 are 850 and 1700.

When one of the numbers is a factor of the other.

One

It is one

The GCF of two prime numbers is 1.

No. If both numbers are even, their GCF must be even itself.

Any positive number can be a GCF. But for each separate set of numbers, there can only be one.

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