1 plus negative 10 is equal to -9.
The sum of -9 and -1 is -10.
When you add -9 and +10, you get (+) 1.
(-1 / 10) + (7 / 10) = 0.6
8 and 1/10
You have 10 "pairs" of numbers which all give the answer, -1 (negative one or minus one). So your sum is -1 + (-1) + (-1) +... Ten times. i.e (-1) multiplied by 10. So the answer is -10 (negative 10).
-4 + -5 + -2 + -1 = -12 (negative 12).
Negative plus a negative is a negative. Ex. -1+-1=-2 Negative times a negative is a positive. -2*-2=4 But a negative [minus] plus a positive [plus] can be minus, zero or plus: For example, -3 + 2 = -1 -3 + 3 = 0 -3 + 4 = +1
-8
10+ (-11) + 5 + (-12) = -1 + 5 -12 = 4 -12 = -8
The sum of -10 and -2 is -12.
-16+(-10) = -26