1. **Problem:** Calculate $-18 \div 3$. 2. **Formula:** Division of integers follows the rule: dividing a negative by a positive gives a negative result, dividing two negatives gives a positive result, and dividing two positives gives a positive result. 3. **Step-by-step:** - Calculate the absolute values: $18 \div 3 = 6$. - Since the dividend is negative and the divisor is positive, the result is negative. 4. **Answer:** $$-18 \div 3 = -6$$ This means when you divide negative eighteen by three, the quotient is negative six.