Worksheets for practicing addition facts to 10 using ten frames.

The task involves completing addition facts to 10 using known number facts. Each bar model represents a sum that equals 10, and the goal is to fill in the missing numbers. Let's solve each section step by step.

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Section 1: Use known number facts to [fill] in the missing numbers on these bar models.

#### Row 1:
- First Bar Model:
- One part is labeled as 6.
- The total is 10.
- Missing number = \( 10 - 6 = 4 \).
- Fill in: 4.

- Second Bar Model:
- One part is labeled as 8.
- The total is 10.
- Missing number = \( 10 - 8 = 2 \).
- Fill in: 2.

#### Row 2:
- First Bar Model:
- One part is labeled as 7.
- The total is 10.
- Missing number = \( 10 - 7 = 3 \).
- Fill in: 3.

- Second Bar Model:
- One part is labeled as 2.
- The total is 10.
- Missing number = \( 10 - 2 = 8 \).
- Fill in: 8.

#### Row 3:
- First Bar Model:
- One part is labeled as 5.
- The total is 10.
- Missing number = \( 10 - 5 = 5 \).
- Fill in: 5.

- Second Bar Model:
- One part is labeled as 1.
- The total is 10.
- Missing number = \( 10 - 1 = 9 \).
- Fill in: 9.

#### Row 4:
- First Bar Model:
- One part is labeled as 4.
- The total is 10.
- Missing number = \( 10 - 4 = 6 \).
- Fill in: 6.

- Second Bar Model:
- One part is labeled as 9.
- The total is 10.
- Missing number = \( 10 - 9 = 1 \).
- Fill in: 1.

#### Row 5:
- First Bar Model:
- One part is labeled as 3.
- The total is 10.
- Missing number = \( 10 - 3 = 7 \).
- Fill in: 7.

- Second Bar Model:
- One part is labeled as 6.
- The total is 10.
- Missing number = \( 10 - 6 = 4 \).
- Fill in: 4.

---

Section 2: Use known number facts to [fill] in the missing numbers on these bar models.

This section is identical to Section 1, so the solutions will be the same:

- Row 1: 4, 2
- Row 2: 3, 8
- Row 3: 5, 9
- Row 4: 6, 1
- Row 5: 7, 4

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Section 3: Use known number facts to [fill] in the missing numbers on these bar models.

#### Row 1:
- First Bar Model:
- One part is labeled as 2.
- The total is 10.
- Missing number = \( 10 - 2 = 8 \).
- Fill in: 8.

- Second Bar Model:
- One part is labeled as 5.
- The total is 10.
- Missing number = \( 10 - 5 = 5 \).
- Fill in: 5.

#### Row 2:
- First Bar Model:
- One part is labeled as 5.
- The total is 10.
- Missing number = \( 10 - 5 = 5 \).
- Fill in: 5.

- Second Bar Model:
- One part is labeled as 7.
- The total is 10.
- Missing number = \( 10 - 7 = 3 \).
- Fill in: 3.

#### Row 3:
- First Bar Model:
- One part is labeled as 1.
- The total is 10.
- Missing number = \( 10 - 1 = 9 \).
- Fill in: 9.

- Second Bar Model:
- One part is labeled as 9.
- The total is 10.
- Missing number = \( 10 - 9 = 1 \).
- Fill in: 1.

#### Row 4:
- First Bar Model:
- One part is labeled as 3.
- The total is 10.
- Missing number = \( 10 - 3 = 7 \).
- Fill in: 7.

- Second Bar Model:
- One part is labeled as 8.
- The total is 10.
- Missing number = \( 10 - 8 = 2 \).
- Fill in: 2.

#### Row 5:
- First Bar Model:
- One part is labeled as 4.
- The total is 10.
- Missing number = \( 10 - 4 = 6 \).
- Fill in: 6.

- Second Bar Model:
- One part is labeled as 6.
- The total is 10.
- Missing number = \( 10 - 6 = 4 \).
- Fill in: 4.

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Final Answer:

- Section 1:
- Row 1: 4, 2
- Row 2: 3, 8
- Row 3: 5, 9
- Row 4: 6, 1
- Row 5: 7, 4

- Section 2:
- Row 1: 4, 2
- Row 2: 3, 8
- Row 3: 5, 9
- Row 4: 6, 1
- Row 5: 7, 4

- Section 3:
- Row 1: 8, 5
- Row 2: 5, 3
- Row 3: 9, 1
- Row 4: 7, 2
- Row 5: 6, 4

\boxed{
\begin{array}{cc}
\text{Section 1:} & \text{Section 2:} & \text{Section 3:} \\
\hline
4, 2 & 4, 2 & 8, 5 \\
3, 8 & 3, 8 & 5, 3 \\
5, 9 & 5, 9 & 9, 1 \\
6, 1 & 6, 1 & 7, 2 \\
7, 4 & 7, 4 & 6, 4 \\
\end{array}
}