In order to find common factors you need two or more numbers. However, the factors of 54 (at least 2 numbers that can be multiplied evenly, or with no remainder, into 54) are: 1,2,3,6,9,18,27, and 54.
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The greatest common factor of 54 and 90 is 18.
The greatest common factor of 54 and 80 is 2
The GCF (Greatest Common Factor) of 54 and 135 is: 27
Since 27 is a factor of 54, and 27 cannot have a larger factor than itself, the greatest common factor of 27 and 54 is 27.
Highest common factor of 36, 42, and 54 is 6.