Question

Find each sum or difference.

$-15+6$

Short answer

The value of the expression is –9.

Step-by-step solution

Step 1. Concept of addition and subtraction.

Two numbers with similar signs get added and the resulting number carries the similar sign.

Two numbers with opposite signs get subtracted and the resulting number carries the sign of the larger number.

Step 2. Subtract a smaller value from a larger.

In order to find the difference, subtract the smaller number from the larger number. So, it gives

$\begin{array}{l}=15-6\\ =9\end{array}$

Step 3. By using the concept of addition and subtraction.

Since the sign of the larger value is negative, the sign of the resulting number should be negative as well.

Therefore, the sum of the given numbers is –9.