Solve -15 + 3 Using Number Line: Step-by-Step Solution

Let's locate negative 15 on the number line.

Since negative 15 is less than 0, we will move fifteen steps to the left of zero, where each step represents one whole number as follows:

Now let's look at the operation in the exercise.

Since the operation is $+3$

And the number 3 is greater than 0, we will move three steps to the right from negative 15, where each step represents one whole number as follows:

We can see that the number we reached is negative 12.