What two numbers have a GCF of 28?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 28.

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 28. Below is the beginning list of multiples of 28 (1 through 7) in numerical order.

1. 28
2. 56
3. 84
4. 112
5. 140
6. 168
7. 196
etc...

Two numbers that have a GCF of 28 can be 28 and any other number on the list above. Thus, two numbers that have a GCF of 28 are:

28 & 56
28 & 84
28 & 112
etc...

That is not all! Any combination of any multiple of 28 and "odd" multiples of 28 will also have GCF of 28. 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 28.

56 & 84
56 & 140
112 & 140
112 & 196
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 28. 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 28, what are the numbers?" or "What are two numbers whose GCF is 28?"

What two numbers have a GCF of 29?
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