https://file.aiquickdraw.com/mathbot/file/1726112094674plhn3pqc.jpg

Let's solve the problems in the image step by step:

### 25. \( 20.25 + (-15.711) \)
This involves adding a positive and a negative number. It's equivalent to subtracting the absolute value of the second number from the first.

\[
20.25 + (-15.711) = 20.25 - 15.711 = 4.539
\]

### 26. \( 8.34 + (-9.16) \)
Again, adding a positive and a negative number, which is like subtracting.

\[
8.34 + (-9.16) = 8.34 - 9.16 = -0.82
\]

### 29. \( 10.9 + (-15.6) + 2.1 \)
First, combine the first two terms:

\[
10.9 + (-15.6) = 10.9 - 15.6 = -4.7
\]
Now, add 2.1:

\[
-4.7 + 2.1 = -2.6
\]

### 30. \( 0.65 + 2.75 + (-1.35) \)
Start with the first two terms:

\[
0.65 + 2.75 = 3.4
\]
Now, add the third term:

\[
3.4 + (-1.35) = 3.4 - 1.35 = 2.05
\]

Let me know if you'd like further details or explanations on any of these steps.

Here are five related questions to expand your understanding:
1. How do you handle addition of negative numbers in general?
2. What is the result of \( (-5.2) + 6.8 \)?
3. How do you simplify expressions with both addition and subtraction of decimals?
4. Why is subtracting a negative number the same as adding its absolute value?
5. How would you compute \( 12.5 + (-8.7) + (-3.4) \)?

**Tip:** When working with negative and positive numbers, treat negative signs like directions: subtracting a negative moves you "forward" while adding a negative moves you "backward."

Solve the following problems: 1) 20.25 + (-15.711), 2) 8.34 + (-9.16), 3) 10.9 + (-15.6) + 2.1, 4) 0.65 + 2.75 + (-1.35)

Learn how to solve addition problems with both positive and negative decimals. Problems include calculations such as 20.25 + (-15.711) and 0.65 + 2.75 + (-1.35). Step-by-step explanations provided for Grades 5-7 students.

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