Answer:
The sum of 3 + (-2) = 1 because it's just like 3 - 2
The sum of -6 + 3 = - 3 because the negative number is greater than positive number it's a negative.
For B you fill in Six negative, -6; three positive, 3. And you are left with three negative counters.
For A you are left with one positve counters.