What two numbers have a GCF of 90?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 90.

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 90. Below is the beginning list of multiples of 90 (1 through 7) in numerical order.

1. 90
2. 180
3. 270
4. 360
5. 450
6. 540
7. 630
etc...

Two numbers that have a GCF of 90 can be 90 and any other number on the list above. Thus, two numbers that have a GCF of 90 are:

90 & 180
90 & 270
90 & 360
etc...

That is not all! Any combination of any multiple of 90 and "odd" multiples of 90 will also have GCF of 90. 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 90.

180 & 270
180 & 450
360 & 450
360 & 630
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 90. 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 90, what are the numbers?" or "What are two numbers whose GCF is 90?"

What two numbers have a GCF of 91?
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