What two numbers have a GCF of 840?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 840.

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 840. Below is the beginning list of multiples of 840 (1 through 7) in numerical order.

1. 840
2. 1680
3. 2520
4. 3360
5. 4200
6. 5040
7. 5880
etc...

Two numbers that have a GCF of 840 can be 840 and any other number on the list above. Thus, two numbers that have a GCF of 840 are:

840 & 1680
840 & 2520
840 & 3360
etc...

That is not all! Any combination of any multiple of 840 and "odd" multiples of 840 will also have GCF of 840. 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 840.

1680 & 2520
1680 & 4200
3360 & 4200
3360 & 5880
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 840. 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 840, what are the numbers?" or "What are two numbers whose GCF is 840?"

What two numbers have a GCF of 841?
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