1 plus negative 1 equals 0. If you add a negative to something, it is bassically taking it away from the adding number. In other words, you can just change the + sign to a - sign. :)
The sum of -1 and -2 is -3.
The sum of -9 and -1 is -10.
The total sum is -12 or negative twelve.
-1
The answer is -7. minus three plus one is minus two, adding a negative is the same as subtraction and so plus negative five means minus 5 so the sum is -2-5=-7 The Sum= -3+1-5 -2-5 -7
The sum of -6/7 and -1/2 is -1 5/14
The sum of -7 and -8 is -15.
The answer would be positive 3.
The sum of 7 and -8 is -1.
The sum of -1/15 and -3/5 is -2/3
The sum of -3/5 and 1/7 is -16/35
negative 4