Tuesday, December 15, 2009

How do you add & subtract negative numbers?

I know a NEGATIVE + NEGATIVE = NEGATIVE


and obviously a POSITIVE + POSITIVE = POSITIVE





Are there any other 'set in stone' rules, or does it depends on something? What does it depend on? Thanks a lot.How do you add %26amp; subtract negative numbers?
Yes, there are rules





if you have for example


4-(-2) then both negatives cancel and gets to be a positive so the answer would be 6





and if it was 4-(+2) then the negative cancels the positve


so the answer is 2





same goes here





4+(-2) the negative cancels the positve so the answer is 2





think of it this way... if negative SIGNS not numbers signs are facing each other then it would turn to positive


if a negative and positive signs are facing each other then the negative cancels the positive. Negative sign is always stronger than the positive





And positive and positive stays the same





examples for everything i gave you





2-(-2)= 4 because negative signs facing each other cancels out to be positive





2-(+2)=0 because negative and positive signs when the face they become negative





2+(+2)= 4 because positive signs stay the same





2+(-2)= 0 because they cancel to be negative





Hope i helpedHow do you add %26amp; subtract negative numbers?
The larger number determines the sign. For example:


1) -8 + 2 = -6


2) 10 + (-6) = 10 - 6 = 4





When a negative is outside of a parenthesis, the numbers in the parenthesis change signs when you take away the parenthesis.


1) 5 - (4 + 5x) = 5 - 4 - 5x = 1 - 5x


2) 10 - (6 - 10) = 10 - (-4) = 10 + 4 = 14
There r no rules but the basic strategy is to substract a smaller no. out of a bigger no.





Here in -ve numbers the no. with higher magnitude is the smallest no.
If the negative number is bigger then the the positive number it is negative and vice versa.

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