Number Bonds Worksheet for practicing addition to 13 with missing addends.

Let's solve each problem on the Number Bonds Worksheet step by step. The goal is to find the missing number that, when added to the given number, equals 13.

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Understanding Number Bonds

Number bonds are pairs of numbers that add up to a specific total. Here, all problems involve finding a number that adds with another to make 13.

We can solve each equation using subtraction:
> If \( x + a = 13 \), then \( x = 13 - a \)

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Solutions:

#### 1 a.
\( \_\_\_\_\_ + 7 = 13 \)
→ \( 13 - 7 = 6 \)
✔ Answer: 6

#### 1 b.
\( \_\_\_\_\_ + 0 = 13 \)
→ \( 13 - 0 = 13 \)
✔ Answer: 13

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#### 2 a.
\( \_\_\_\_\_ + 10 = 13 \)
→ \( 13 - 10 = 3 \)
✔ Answer: 3

#### 2 b.
\( \_\_\_\_\_ + 12 = 13 \)
→ \( 13 - 12 = 1 \)
✔ Answer: 1

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#### 3 a.
\( 12 + \_\_\_\_\_ = 13 \)
→ \( 13 - 12 = 1 \)
✔ Answer: 1

#### 3 b.
\( 7 + \_\_\_\_\_ = 13 \)
→ \( 13 - 7 = 6 \)
✔ Answer: 6

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#### 4 a.
\( \_\_\_\_\_ + 6 = 13 \)
→ \( 13 - 6 = 7 \)
✔ Answer: 7

#### 4 b.
\( 1 + \_\_\_\_\_ = 13 \)
→ \( 13 - 1 = 12 \)
✔ Answer: 12

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#### 5 a.
\( 4 + \_\_\_\_\_ = 13 \)
→ \( 13 - 4 = 9 \)
✔ Answer: 9

#### 5 b.
\( \_\_\_\_\_ + 13 = 13 \)
→ \( 13 - 13 = 0 \)
✔ Answer: 0

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#### 6 a.
\( \_\_\_\_\_ + 5 = 13 \)
→ \( 13 - 5 = 8 \)
✔ Answer: 8

#### 6 b.
\( 3 + \_\_\_\_\_ = 13 \)
→ \( 13 - 3 = 10 \)
✔ Answer: 10

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#### 7 a.
\( 11 + \_\_\_\_\_ = 13 \)
→ \( 13 - 11 = 2 \)
✔ Answer: 2

#### 7 b.
\( 8 + \_\_\_\_\_ = 13 \)
→ \( 13 - 8 = 5 \)
✔ Answer: 5

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#### 8 a.
\( 10 + \_\_\_\_\_ = 13 \)
→ \( 13 - 10 = 3 \)
✔ Answer: 3

#### 8 b.
\( 9 + \_\_\_\_\_ = 13 \)
→ \( 13 - 9 = 4 \)
✔ Answer: 4

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#### 9 a.
\( 6 + \_\_\_\_\_ = 13 \)
→ \( 13 - 6 = 7 \)
✔ Answer: 7

#### 9 b.
\( \_\_\_\_\_ + 11 = 13 \)
→ \( 13 - 11 = 2 \)
✔ Answer: 2

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#### 10 a.
\( 5 + \_\_\_\_\_ = 13 \)
→ \( 13 - 5 = 8 \)
✔ Answer: 8

#### 10 b.
\( \_\_\_\_\_ + 4 = 13 \)
→ \( 13 - 4 = 9 \)
✔ Answer: 9

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✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1a | 6 |
| 1b | 13 |
| 2a | 3 |
| 2b | 1 |
| 3a | 1 |
| 3b | 6 |
| 4a | 7 |
| 4b | 12 |
| 5a | 9 |
| 5b | 0 |
| 6a | 8 |
| 6b | 10 |
| 7a | 2 |
| 7b | 5 |
| 8a | 3 |
| 8b | 4 |
| 9a | 7 |
| 9b | 2 |
| 10a | 8 |
| 10b | 9 |

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🔍 Explanation:

Each problem is based on the idea of number bonds to 13. By subtracting the known addend from 13, we find the missing number. This reinforces addition and subtraction fact families and helps build mental math skills.

For example:
- In \( 6 + ? = 13 \), think: "What goes with 6 to make 13?" → 7
- Or use subtraction: \( 13 - 6 = 7 \)

This worksheet helps students understand how numbers combine to form a whole (in this case, 13).

Let me know if you'd like a printable version or visual representation!