Multiplying positive numbers will result in a positive number.
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All numbers have factors. The factors that are positive numbers are known as positive factors.
All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are called common factors. Some factors are positive numbers. Common factors which are positive numbers would be called positive common factors.
You are working with numbers. One is a whole number and the other is a fraction of a whole number (with a decimal point, etc). You apply the same principles of subtracting one number from another or a fraction of one number from a fraction of another. Numbers is numbers!
The same way as finding factors of positive numbers but the answer includes both the positive and negative factors.
Since negative numbers also have positive factors, their GCF would be the same as if the original numbers were positive.