We need to calculate the product of $-12$ and $15$. That is, we need to find the value of $-12 \times 15$.

1. Problem Description

We need to calculate the product of $-12$ and $15$. That is, we need to find the value of $-12 \times 15$.

2. Solution Steps

First, we can ignore the negative sign and multiply the absolute values of the two numbers.

$12 \times 15$ can be calculated as follows:

$12 \times 15 = 12 \times (10 + 5) = 12 \times 10 + 12 \times 5 = 120 + 60 = 180$

Now, we consider the sign. Since one number is negative and the other is positive, the product is negative.

Therefore, $-12 \times 15 = -180$.

3. Final Answer

-180