Pumpkin-themed math worksheet for practicing addition sums with a color-by-number activity.

Problem Description:

The task involves coloring the sections of a pumpkin based on the sums of the numbers provided in each section. The key for coloring is as follows:
- Sums of 1: Color yellow
- Sums of 2: Color red
- Sums of 3: Color blue
- Sums of 4: Color green

We need to calculate the sum of each pair of numbers in the pumpkin and color the corresponding sections accordingly.

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Step-by-Step Solution:

#### 1. Identify and Calculate Each Sum:
We will go through each section of the pumpkin and calculate the sum of the two numbers provided.

- Top Row:
- \( 4 + 0 = 4 \) (Green)
- \( 1 + 3 = 4 \) (Green)
- \( 3 + 1 = 4 \) (Green)
- \( 0 + 1 = 1 \) (Yellow)

- Second Row:
- \( 2 + 2 = 4 \) (Green)
- \( 1 + 2 = 3 \) (Blue)
- \( 0 + 2 = 2 \) (Red)
- \( 2 + 0 = 2 \) (Red)

- Third Row:
- \( 2 + 1 = 3 \) (Blue)
- \( 1 + 1 = 2 \) (Red)
- \( 3 + 0 = 3 \) (Blue)
- \( 0 + 3 = 3 \) (Blue)
- \( 3 + 1 = 4 \) (Green)

- Bottom Row:
- \( 0 + 4 = 4 \) (Green)
- \( 1 + 0 = 1 \) (Yellow)
- \( 2 + 1 = 3 \) (Blue)

#### 2. Assign Colors Based on Sums:
Now, we assign the colors to each section based on the calculated sums:

- Sums of 1 (Yellow):
- \( 0 + 1 \)
- \( 1 + 0 \)

- Sums of 2 (Red):
- \( 1 + 1 \)
- \( 0 + 2 \)
- \( 2 + 0 \)

- Sums of 3 (Blue):
- \( 1 + 2 \)
- \( 2 + 1 \)
- \( 3 + 0 \)
- \( 0 + 3 \)
- \( 3 + 1 \)
- \( 2 + 1 \)

- Sums of 4 (Green):
- \( 4 + 0 \)
- \( 1 + 3 \)
- \( 3 + 1 \)
- \( 2 + 2 \)
- \( 0 + 4 \)
- \( 3 + 1 \)

#### 3. Final Coloring:
Using the above calculations, the sections of the pumpkin should be colored as follows:
- Yellow: Sections with sums of 1.
- Red: Sections with sums of 2.
- Blue: Sections with sums of 3.
- Green: Sections with sums of 4.

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Final Answer:

\[
\boxed{
\text{Color the sections as follows:}
\begin{aligned}
&\text{Yellow: } 0+1, 1+0 \\
&\text{Red: } 1+1, 0+2, 2+0 \\
&\text{Blue: } 1+2, 2+1, 3+0, 0+3, 3+1, 2+1 \\
&\text{Green: } 4+0, 1+3, 3+1, 2+2, 0+4, 3+1
\end{aligned}
}
\]