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You can compare their magnitude (absolute values) but not the numbers themselves.
You need two numbers to compare to have a gcf.
Some integers are positive numbers.Some integers are not positive numbers.Some positive numbers are integers.Some positive numbers are not integers.They are two sets whose intersection is the set of counting numbers.
- 8/2 = - 4
For a Greatest Common Factor to exist, there need to be two or more numbers to compare.