Double Column Fill Ups math worksheet for practicing addition and subtraction by finding missing addends.

Problem Analysis:

The task involves solving a series of addition problems where you need to find the missing addend in each equation. The key is to use the opposite operation (subtraction) to determine the missing number that makes both sides of the equation equal.

Step-by-Step Solution:

#### Section 1:
Find the new addend that gives the same result.

1. 4 + 4 = 5 + __
- Calculate the left side: \( 4 + 4 = 8 \)
- Set up the equation: \( 5 + x = 8 \)
- Solve for \( x \): \( x = 8 - 5 = 3 \)
- Answer: \( 4 + 4 = 5 + 3 \)

2. 7 + 4 = 10 + __
- Calculate the left side: \( 7 + 4 = 11 \)
- Set up the equation: \( 10 + x = 11 \)
- Solve for \( x \): \( x = 11 - 10 = 1 \)
- Answer: \( 7 + 4 = 10 + 1 \)

3. 9 + 6 = 10 + __
- Calculate the left side: \( 9 + 6 = 15 \)
- Set up the equation: \( 10 + x = 15 \)
- Solve for \( x \): \( x = 15 - 10 = 5 \)
- Answer: \( 9 + 6 = 10 + 5 \)

4. 9 + 8 = 10 + __
- Calculate the left side: \( 9 + 8 = 17 \)
- Set up the equation: \( 10 + x = 17 \)
- Solve for \( x \): \( x = 17 - 10 = 7 \)
- Answer: \( 9 + 8 = 10 + 7 \)

5. 7 + 8 = 9 + __
- Calculate the left side: \( 7 + 8 = 15 \)
- Set up the equation: \( 9 + x = 15 \)
- Solve for \( x \): \( x = 15 - 9 = 6 \)
- Answer: \( 7 + 8 = 9 + 6 \)

6. 6 + 5 = 8 + __
- Calculate the left side: \( 6 + 5 = 11 \)
- Set up the equation: \( 8 + x = 11 \)
- Solve for \( x \): \( x = 11 - 8 = 3 \)
- Answer: \( 6 + 5 = 8 + 3 \)

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#### Section 2:
Find the new addend that gives the same result.

1. 6 + 7 = 10 + __
- Calculate the left side: \( 6 + 7 = 13 \)
- Set up the equation: \( 10 + x = 13 \)
- Solve for \( x \): \( x = 13 - 10 = 3 \)
- Answer: \( 6 + 7 = 10 + 3 \)

2. 9 + 7 = 10 + __
- Calculate the left side: \( 9 + 7 = 16 \)
- Set up the equation: \( 10 + x = 16 \)
- Solve for \( x \): \( x = 16 - 10 = 6 \)
- Answer: \( 9 + 7 = 10 + 6 \)

3. 8 + 8 = 10 + __
- Calculate the left side: \( 8 + 8 = 16 \)
- Set up the equation: \( 10 + x = 16 \)
- Solve for \( x \): \( x = 16 - 10 = 6 \)
- Answer: \( 8 + 8 = 10 + 6 \)

4. 6 + 5 = 10 + __
- Calculate the left side: \( 6 + 5 = 11 \)
- Set up the equation: \( 10 + x = 11 \)
- Solve for \( x \): \( x = 11 - 10 = 1 \)
- Answer: \( 6 + 5 = 10 + 1 \)

5. 7 + 5 = 10 + __
- Calculate the left side: \( 7 + 5 = 12 \)
- Set up the equation: \( 10 + x = 12 \)
- Solve for \( x \): \( x = 12 - 10 = 2 \)
- Answer: \( 7 + 5 = 10 + 2 \)

6. 8 + 6 = 10 + __
- Calculate the left side: \( 8 + 6 = 14 \)
- Set up the equation: \( 10 + x = 14 \)
- Solve for \( x \): \( x = 14 - 10 = 4 \)
- Answer: \( 8 + 6 = 10 + 4 \)

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#### Section 3:
Find the new addend that gives the same result.

1. 9 + 5 = __ + 4
- Calculate the left side: \( 9 + 5 = 14 \)
- Set up the equation: \( x + 4 = 14 \)
- Solve for \( x \): \( x = 14 - 4 = 10 \)
- Answer: \( 9 + 5 = 10 + 4 \)

2. 5 + 8 = 10 + __
- Calculate the left side: \( 5 + 8 = 13 \)
- Set up the equation: \( 10 + x = 13 \)
- Solve for \( x \): \( x = 13 - 10 = 3 \)
- Answer: \( 5 + 8 = 10 + 3 \)

3. 8 + 7 = 10 + __
- Calculate the left side: \( 8 + 7 = 15 \)
- Set up the equation: \( 10 + x = 15 \)
- Solve for \( x \): \( x = 15 - 10 = 5 \)
- Answer: \( 8 + 7 = 10 + 5 \)

4. 9 + 9 = __ + 8
- Calculate the left side: \( 9 + 9 = 18 \)
- Set up the equation: \( x + 8 = 18 \)
- Solve for \( x \): \( x = 18 - 8 = 10 \)
- Answer: \( 9 + 9 = 10 + 8 \)

5. 6 + 6 = __ + 2
- Calculate the left side: \( 6 + 6 = 12 \)
- Set up the equation: \( x + 2 = 12 \)
- Solve for \( x \): \( x = 12 - 2 = 10 \)
- Answer: \( 6 + 6 = 10 + 2 \)

6. 7 + 6 = 10 + __
- Calculate the left side: \( 7 + 6 = 13 \)
- Set up the equation: \( 10 + x = 13 \)
- Solve for \( x \): \( x = 13 - 10 = 3 \)
- Answer: \( 7 + 6 = 10 + 3 \)

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Final Answers:

\[
\boxed{
\begin{array}{ll}
4 + 4 = 5 + 3 & 7 + 4 = 10 + 1 \\
9 + 6 = 10 + 5 & 9 + 8 = 10 + 7 \\
7 + 8 = 9 + 6 & 6 + 5 = 8 + 3 \\
6 + 7 = 10 + 3 & 9 + 7 = 10 + 6 \\
8 + 8 = 10 + 6 & 6 + 5 = 10 + 1 \\
7 + 5 = 10 + 2 & 8 + 6 = 10 + 4 \\
9 + 5 = 10 + 4 & 5 + 8 = 10 + 3 \\
8 + 7 = 10 + 5 & 9 + 9 = 10 + 8 \\
6 + 6 = 10 + 2 & 7 + 6 = 10 + 3 \\
\end{array}
}
\]