They are all:
-positive numbers
-composite numbers (have more than 2 factors)
-integers
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28 and 56
The Greatest Common Factor of 28 and 60 is four. 28 divided by 4 is 7, and 60 divided by 4 is 15. To show that it is the greatest 7 nor 15 can be reduced.
The GCF of 25 and 60 is 5.
The LCM is: 300
The GCF is 5.