Inverse Addition Practice worksheet with 18 problems for solving missing addends.

Problem Description:

The task involves solving a series of addition problems where the missing number is at the beginning of each equation. To solve these, we use the inverse operation (subtraction) to find the missing number.

Solution Approach:

For each problem, we are given an equation in the form:
\[ \text{Missing Number} + \text{Addend} = \text{Sum} \]

To find the missing number, we subtract the addend from the sum:
\[ \text{Missing Number} = \text{Sum} - \text{Addend} \]

We will solve each problem step by step.

---

Detailed Solutions:

#### Problems 1–10:
1. \( \_\_ + 3 = 6 \)
\[
\text{Missing Number} = 6 - 3 = 3
\]
Answer: 3

2. \( \_\_ + 8 = 11 \)
\[
\text{Missing Number} = 11 - 8 = 3
\]
Answer: 3

3. \( \_\_ + 1 = 3 \)
\[
\text{Missing Number} = 3 - 1 = 2
\]
Answer: 2

4. \( \_\_ + 10 = 17 \)
\[
\text{Missing Number} = 17 - 10 = 7
\]
Answer: 7

5. \( \_\_ + 5 = 8 \)
\[
\text{Missing Number} = 8 - 5 = 3
\]
Answer: 3

6. \( \_\_ + 10 = 12 \)
\[
\text{Missing Number} = 12 - 10 = 2
\]
Answer: 2

7. \( \_\_ + 4 = 8 \)
\[
\text{Missing Number} = 8 - 4 = 4
\]
Answer: 4

8. \( \_\_ + 9 = 15 \)
\[
\text{Missing Number} = 15 - 9 = 6
\]
Answer: 6

9. \( \_\_ + 2 = 10 \)
\[
\text{Missing Number} = 10 - 2 = 8
\]
Answer: 8

10. \( \_\_ + 14 = 18 \)
\[
\text{Missing Number} = 18 - 14 = 4
\]
Answer: 4

---

#### Problems 11–20:
11. \( \_\_ + 11 = 13 \)
\[
\text{Missing Number} = 13 - 11 = 2
\]
Answer: 2

12. \( \_\_ + 3 = 5 \)
\[
\text{Missing Number} = 5 - 3 = 2
\]
Answer: 2

13. \( \_\_ + 12 = 16 \)
\[
\text{Missing Number} = 16 - 12 = 4
\]
Answer: 4

14. \( \_\_ + 2 = 7 \)
\[
\text{Missing Number} = 7 - 2 = 5
\]
Answer: 5

15. \( \_\_ + 13 = 14 \)
\[
\text{Missing Number} = 14 - 13 = 1
\]
Answer: 1

16. \( \_\_ + 5 = 9 \)
\[
\text{Missing Number} = 9 - 5 = 4
\]
Answer: 4

17. \( \_\_ + 6 = 19 \)
\[
\text{Missing Number} = 19 - 6 = 13
\]
Answer: 13

18. \( \_\_ + 7 = 20 \)
\[
\text{Missing Number} = 20 - 7 = 13
\]
Answer: 13

---

Final Answers:

\[
\boxed{
\begin{array}{ll}
1. & 3 \\
2. & 3 \\
3. & 2 \\
4. & 7 \\
5. & 3 \\
6. & 2 \\
7. & 4 \\
8. & 6 \\
9. & 8 \\
10. & 4 \\
11. & 2 \\
12. & 2 \\
13. & 4 \\
14. & 5 \\
15. & 1 \\
16. & 4 \\
17. & 13 \\
18. & 13 \\
\end{array}
}
\]