The expression you're dealing with is:

$(-1) + (-2) + (-3)$

To simplify it, let's break it down step by step:

Step 1: Add the first two terms:

$(-1) + (-2) = -3$ Here, you're adding two negative numbers. When adding negative numbers, the result is negative, and you add their absolute values together. So: $1 + 2 = 3 \quad \text{and the result is} \quad -3.$

Step 2: Add the third term:

Now, add the third term to -3: $-3 + (-3) = -6$ Similarly, you're adding another negative number, so the result is negative, and you add the absolute values: $3 + 3 = 6 \quad \text{and the result is} \quad -6.$

Final result:

The value of the expression is: $(-1) + (-2) + (-3) = -6.$

Key points:

• Adding negative numbers results in a more negative value.
• When adding negative numbers, you add their absolute values, and the result stays negative.

Would you like more details or have any questions on this?

Here are some related questions for further practice:

1. What happens when you add a positive and a negative number, e.g., $3 + (-4)$?
2. How would the result change if the numbers were all positive?
3. Can the sum of two negative numbers ever be positive?
4. What is the result of adding $(-5) + (-10) + (-15)$?
5. How would you solve $(-7) + 5 + (-3)$?

Tip: When adding multiple negative numbers, you can first add the absolute values and then apply the negative sign to the result.