What two numbers have a GCF of 40?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 40.

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 40. Below is the beginning list of multiples of 40 (1 through 7) in numerical order.

1. 40
2. 80
3. 120
4. 160
5. 200
6. 240
7. 280
etc...

Two numbers that have a GCF of 40 can be 40 and any other number on the list above. Thus, two numbers that have a GCF of 40 are:

40 & 80
40 & 120
40 & 160
etc...

That is not all! Any combination of any multiple of 40 and "odd" multiples of 40 will also have GCF of 40. 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 40.

80 & 120
80 & 200
160 & 200
160 & 280
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 40. 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 40, what are the numbers?" or "What are two numbers whose GCF is 40?"

What two numbers have a GCF of 41?
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