Identify Signs of Numbers: Identify the signs of the numbers involved in the calculation. We have two negative numbers, −6 and −3, and one negative number, −4. Since all numbers are negative, the result will also be negative.
Add Negative Numbers: Add the first two negative numbers together. When adding two negative numbers, we add their absolute values and keep the negative sign. So, (−6)+(−3) equals −9.
Subtract Positive Number: Subtract 4 from the result of Step 2. Since we are subtracting a positive number from a negative number, we will increase the absolute value of the negative result. So, −9−4 equals −13.