The same as with positive numbers. The factors of negative numbers have the same absolute value. One set positive, one set negative.
Example: -12
1,2,3,4,6,12,-1,-2,-3,-4,-6,-12
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The numbers are the same as positive numbers, just the signs change. Write out the factor pairs as if the number were positive, but make one of the numbers positive and one negative. Now write the same pairs over again and reverse the signs. Negative numbers have twice as many factor pairs as positive numbers do.
Where do we see negative numbers
It belongs to the set of negative rational numbers, negative real numbers, fractionall numbers, rational numbers, real numbers.
No, not all negative numbers are rational. There are many negative numbers that are irrational, just like the positive numbers.
Rational numbers can be negative or positive.