It's either positive or negative depending on the number that is greater than the second number. Example subtract 10 from 20 the answer is 10. 20 as being the greater than 10. Another example subtract 5 from -10 the answer is -15. -10 as being the greater than 5. Take note when subtracting positive and negative integers you change the sign of the subtrahend.
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Subtract negative 3.
A little awkwardly phrased, so I'll answer both ways. To subtract a negative from anything, add its positive. To subtract a positive from a negative, the equation is treated as though you are adding two postives, the result is negative.
1
In the same way that you would answer a fraction subtract another fraction. The result could be either positive or negative, just as is the case with negative whole numbers.
30