Math worksheet for practicing addition within 20 using number lines.

Problem Description:

The task involves solving addition problems using a number line. The goal is to add two numbers and determine the result by visualizing the addition on the provided number lines.

Steps to Solve Each Problem:

#### 1) \( 6 + 7 \)

- Start at 6 on the number line.
- Move 7 units to the right.
- You will land on 13.

Answer: \( 6 + 7 = 13 \)

#### 2) \( 14 + 4 \)

- Start at 14 on the number line.
- Move 4 units to the right.
- You will land on 18.

Answer: \( 14 + 4 = 18 \)

#### 3) \( 9 + 5 \)

- Start at 9 on the number line.
- Move 5 units to the right.
- You will land on 14.

Answer: \( 9 + 5 = 14 \)

#### 4) \( 12 + 3 \)

- Start at 12 on the number line.
- Move 3 units to the right.
- You will land on 15.

Answer: \( 12 + 3 = 15 \)

#### 5) \( 15 + 5 \)

- Start at 15 on the number line.
- Move 5 units to the right.
- You will land on 20.

Answer: \( 15 + 5 = 20 \)

#### 6) \( 4 + 8 \)

- Start at 4 on the number line.
- Move 8 units to the right.
- You will land on 12.

Answer: \( 4 + 8 = 12 \)

#### 7) \( 11 + 4 \)

- Start at 11 on the number line.
- Move 4 units to the right.
- You will land on 15.

Answer: \( 11 + 4 = 15 \)

#### 8) \( 18 + 2 \)

- Start at 18 on the number line.
- Move 2 units to the right.
- You will land on 20.

Answer: \( 18 + 2 = 20 \)

Final Answers:

\[
\boxed{
\begin{aligned}
1) & \quad 6 + 7 = 13 \\
2) & \quad 14 + 4 = 18 \\
3) & \quad 9 + 5 = 14 \\
4) & \quad 12 + 3 = 15 \\
5) & \quad 15 + 5 = 20 \\
6) & \quad 4 + 8 = 12 \\
7) & \quad 11 + 4 = 15 \\
8) & \quad 18 + 2 = 20
\end{aligned}
}
\]