It depends on the two numbers. A negative plus a positive can be either positive or negative.

If the larger number is positive, then adding the negative number will result in a positive. If the smaller number is positive, then adding a negative number will result in a negative. If they're equal, then the result is zero.

Addition -- (+3) + (+5) = (+8) -- The signs are both plus, thus add the digits and write a plus value. (-3) + (+5) = (+2) -- The signs are different, thus take the difference between the digits and write the sign of the larger digit. (-3) + (-5) = (-8) -- The signs are both minus, thus add the digits and write a negative value. (+3) + (-5) = (-2) -- The signs are different, thus take the difference between the digits and write the sign of the larger digit. Subtraction --

(+3) - (+5) = +3 - 5 = (-2) -- Change the sign before the second digit. Take the difference between the digits and write the sign of the larger digit. (-3) -(+5) = -3 - 5 = (-8) -- Change the sign before the second digit. Add the digits and write a negative value. (-3) - (-5) = -3 +5 = (+2) -- Change the sign before the second digit. Take the difference between the digits and write the sign of the larger digit. (+3) - (-5) = +3 +5 = (+8) -- Change the sign before the second digit. Add the digits and write a positive value. Multiplication --

(+6) x (+3) = (+18) -- The signs are both plus, thus multiply and add a plus value. (+6) x (-3) = (-18) -- The signs are different, thus multiply and add a minus value. (-6) x (-3) = (+18) -- The signs are both minus, thus multiply and add a plus value. (-6) x (+3) = (-18) -- The signs are different, thus multiply and add a minus value. Division -- (+6) ÷ (+3) = (+18) -- The signs are both plus, thus divide and add a plus value. (+6) ÷ (-3) = (-18) -- The signs are different, thus divide and add a minus value. (-6) ÷ (-3) = (+18) -- The signs are both minus, thus divide and add a plus value. (-6) ÷ (+3) = (-18) -- The signs are different, thus divide and add a minus value.

So, say your first number is -10 as an example, and you were going to ad 11 to that; -10 + 11 = 0 - 10 + 11 = 1.

~or~ you can switch the places in addition; -10 + 11 = 11 - 10 = 1, or if you wish to think of zero as your starting point you would have; 0 - 10 + 11 = 0 + 11 - 10 = 1

Well there are some cases- 1)when you mean the same number is both positive and negative eg. +10-10=0 2)when you mean different numbers are positive and negative I)Bigger number is negative and smaller number is positive eg. +10-9=0 ii)Bigger number is positive and smaller number is negative eg. +14-8=6