how to compute 10 - 3 -12

10 - 15 = -5

To compute the expression 10 - 3 - 12, you need to follow the order of operations, also known as PEMDAS, which stands for Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Let's break down the calculation step by step:

Step 1: Start with the leftmost operation, which is subtraction.
10 - 3 = 7

Step 2: Next, subtract the remaining number.
7 - 12 = -5

Therefore, the result of 10 - 3 - 12 is -5.