Commutative Property of Addition Worksheets with Answer Key - Free Printable

Problem Explanation:

The worksheet is about the Commutative Property of Addition, which states that the order of adding numbers does not affect the sum. Mathematically, this property is expressed as:
\[
a + b = b + a
\]
For example, \(10 + 5 = 5 + 10\).

The task is to fill in the blanks in each equation so that both sides of the equation are equal, demonstrating the commutative property.

Solution:

#### Example:
\[
10 + 5 = 5 + 10
\]
This is already filled in correctly as an example.

---

#### Problem 1:
\[
16 + 6 = 6 + \_\_
\]
Using the commutative property:
\[
16 + 6 = 6 + 16
\]
So, the blank is 16.

#### Problem 2:
\[
11 + 4 = \_\_ + 11
\]
Using the commutative property:
\[
11 + 4 = 4 + 11
\]
So, the blank is 4.

#### Problem 3:
\[
6 + 8 = \_\_ + 6
\]
Using the commutative property:
\[
6 + 8 = 8 + 6
\]
So, the blank is 8.

#### Problem 4:
\[
7 + 9 = \_\_ + 7
\]
Using the commutative property:
\[
7 + 9 = 9 + 7
\]
So, the blank is 9.

#### Problem 5:
\[
2 + \_\_ = 3 + 2
\]
Using the commutative property:
\[
2 + 3 = 3 + 2
\]
So, the blank is 3.

#### Problem 6:
\[
9 + \_\_ = 10 + 9
\]
Using the commutative property:
\[
9 + 10 = 10 + 9
\]
So, the blank is 10.

#### Problem 7:
\[
4 + \_\_ = 5 + 4
\]
Using the commutative property:
\[
4 + 5 = 5 + 4
\]
So, the blank is 5.

#### Problem 8:
\[
11 + \_\_ = 7 + 11
\]
Using the commutative property:
\[
11 + 7 = 7 + 11
\]
So, the blank is 7.

#### Problem 9:
\[
12 + 9 = \_\_ + 12
\]
Using the commutative property:
\[
12 + 9 = 9 + 12
\]
So, the blank is 9.

#### Problem 10:
\[
13 + \_\_ = 5 + 13
\]
Using the commutative property:
\[
13 + 5 = 5 + 13
\]
So, the blank is 5.

#### Problem 11:
\[
14 + \_\_ = 3 + 14
\]
Using the commutative property:
\[
14 + 3 = 3 + 14
\]
So, the blank is 3.

#### Problem 12:
\[
8 + 16 = \_\_ + 8
\]
Using the commutative property:
\[
8 + 16 = 16 + 8
\]
So, the blank is 16.

#### Problem 13:
\[
6 + \_\_ = 7 + 6
\]
Using the commutative property:
\[
6 + 7 = 7 + 6
\]
So, the blank is 7.

#### Problem 14:
\[
8 + 12 = \_\_ + 8
\]
Using the commutative property:
\[
8 + 12 = 12 + 8
\]
So, the blank is 12.

#### Problem 15:
\[
13 + 12 = 12 + \_\_
\]
Using the commutative property:
\[
13 + 12 = 12 + 13
\]
So, the blank is 13.

---

Final Answer:

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