What two numbers have a GCF of 690?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 690.

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 690. Below is the beginning list of multiples of 690 (1 through 7) in numerical order.

1. 690
2. 1380
3. 2070
4. 2760
5. 3450
6. 4140
7. 4830
etc...

Two numbers that have a GCF of 690 can be 690 and any other number on the list above. Thus, two numbers that have a GCF of 690 are:

690 & 1380
690 & 2070
690 & 2760
etc...

That is not all! Any combination of any multiple of 690 and "odd" multiples of 690 will also have GCF of 690. 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 690.

1380 & 2070
1380 & 3450
2760 & 3450
2760 & 4830
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 690. 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 690, what are the numbers?" or "What are two numbers whose GCF is 690?"

What two numbers have a GCF of 691?
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