Rule: if you have two numbers you are dividing and they are both positive, then the result is positive. If both are negative, then the result is positive (the two negatives cancel out). If only one number is negative and the other positive, then the final result is negative.
Another rule: if the first number of the division problem is 0 and other number is not zero, then the result is 0. If you divide some nonzero number over 0, then the result is undefined. You cannot divide by 0. The zero cannot be in the denominator.