What two numbers have a GCF of 660?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 660.

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 660. Below is the beginning list of multiples of 660 (1 through 7) in numerical order.

1. 660
2. 1320
3. 1980
4. 2640
5. 3300
6. 3960
7. 4620
etc...

Two numbers that have a GCF of 660 can be 660 and any other number on the list above. Thus, two numbers that have a GCF of 660 are:

660 & 1320
660 & 1980
660 & 2640
etc...

That is not all! Any combination of any multiple of 660 and "odd" multiples of 660 will also have GCF of 660. 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 660.

1320 & 1980
1320 & 3300
2640 & 3300
2640 & 4620
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 660. 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 660, what are the numbers?" or "What are two numbers whose GCF is 660?"

What two numbers have a GCF of 661?
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