What two numbers have a GCF of 689?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 689.

There is actually an infinite number of answers to this question. First, note that both the numbers we are looking for must be multiples of 689. Below is the beginning list of multiples of 689 (1 through 7) in numerical order.

1. 689
2. 1378
3. 2067
4. 2756
5. 3445
6. 4134
7. 4823
etc...

Two numbers that have a GCF of 689 can be 689 and any other number on the list above. Thus, two numbers that have a GCF of 689 are:

689 & 1378
689 & 2067
689 & 2756
etc...

That is not all! Any combination of any multiple of 689 and "odd" multiples of 689 will also have GCF of 689. We numbered the multiples above so it would be easy to identify the "odd" multiples (number 1, 3, 5, 7, etc). Thus, here are some more examples of two numbers that also have a GCF of 689.

1378 & 2067
1378 & 3445
2756 & 3445
2756 & 4823
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 689. The lists we created can go on forever.

Two numbers have a GCF of Calculator
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Teacher Tip: If you are a teacher, you could ask these questions of your students: "I am thinking of two numbers and the GCF is 689, what are the numbers?" or "What are two numbers whose GCF is 689?"

What two numbers have a GCF of 690?
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