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The worksheet contains problems where you're asked to rewrite a subtraction expression as an equivalent addition expression and then solve it. Additionally, for each problem, you need to write the unknown addend equation.

Let's go through the problems one by one:

### 6. Original Expression: \(-9 - (-9)\)
- Equivalent Addition: \(-9 + 9\)
- Solution: \( -9 + 9 = 0 \)
- Unknown Addend Equation: \(-9 + ? = 0\) (The unknown addend is \(9\)).

### 7. Original Expression: \(4 - 9\)
- Equivalent Addition: \(4 + (-9)\)
- Solution: \( 4 + (-9) = -5 \)
- Unknown Addend Equation: \(4 + ? = -5\) (The unknown addend is \(-9\)).

### 8. Original Expression: \(25 - 29\)
- Equivalent Addition: \(25 + (-29)\)
- Solution: \( 25 + (-29) = -4 \)
- Unknown Addend Equation: \(25 + ? = -4\) (The unknown addend is \(-29\)).

### 9. Original Expression: \(-12 - (-5)\)
- Equivalent Addition: \(-12 + 5\)
- Solution: \( -12 + 5 = -7 \)
- Unknown Addend Equation: \(-12 + ? = -7\) (The unknown addend is \(5\)).

### 10. Original Expression: \(-21 - (-30)\)
- Equivalent Addition: \(-21 + 30\)
- Solution: \( -21 + 30 = 9 \)
- Unknown Addend Equation: \(-21 + ? = 9\) (The unknown addend is \(30\)).

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Would you like more details on any of these steps? Here are some additional questions related to these concepts:

1. Why does subtracting a negative number result in addition?
2. How do you determine the unknown addend in such equations?
3. What is the difference between subtracting and adding negative numbers?
4. How can these addition expressions be used to solve more complex equations?
5. How would these problems change if decimals or fractions were involved?

**Tip:** Always remember that subtracting a negative number is equivalent to adding its positive counterpart.

The worksheet asks students to rewrite subtraction expressions as equivalent addition expressions, find the sum, and fill in the unknown addend.

Learn how to convert subtraction problems involving integers into addition expressions and find the sum. This worksheet is aimed at Grade 7 students and includes problems like -9 - (-9) and 4 - 9, guiding you to use the concept of adding the opposite.

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