To answer a division or multiplication involving negatives, you first complete the sum as if the negatives weren't there. In this case we'd do 100/4, which comes out at 25. The next step is to assess if this answer is negative or positive. If both numbers in the question are the same (both negative or both positive) then the answer is positive. If one is positive and the other negative, then the answer is negative. In this case, both are negative, so the answer is positive 25.
16
3
1
Four divided by a negative half is negative eight.
16
-4/-4= +1
negative 4
4
25
0.25
4
When any number is divided by a negative number the result is negative. So, 120 / -4 = -30