Number Bonds Worksheet for practicing addition to 12.

The task involves solving a series of number bond problems where the goal is to find the missing number that, when added to the given number, equals 12. Let's solve each problem step by step.

Problem Set

#### 1a. \( 10 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 10 = 2 \]
So, the answer is:
\[ \boxed{2} \]

#### 1b. \( \_\_\_ + 8 = 12 \)
To find the missing number:
\[ 12 - 8 = 4 \]
So, the answer is:
\[ \boxed{4} \]

#### 2a. \( \_\_\_ + 4 = 12 \)
To find the missing number:
\[ 12 - 4 = 8 \]
So, the answer is:
\[ \boxed{8} \]

#### 2b. \( 5 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 5 = 7 \]
So, the answer is:
\[ \boxed{7} \]

#### 3a. \( \_\_\_ + 11 = 12 \)
To find the missing number:
\[ 12 - 11 = 1 \]
So, the answer is:
\[ \boxed{1} \]

#### 3b. \( \_\_\_ + 0 = 12 \)
To find the missing number:
\[ 12 - 0 = 12 \]
So, the answer is:
\[ \boxed{12} \]

#### 4a. \( \_\_\_ + 1 = 12 \)
To find the missing number:
\[ 12 - 1 = 11 \]
So, the answer is:
\[ \boxed{11} \]

#### 4b. \( 1 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 1 = 11 \]
So, the answer is:
\[ \boxed{11} \]

#### 5a. \( 6 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 6 = 6 \]
So, the answer is:
\[ \boxed{6} \]

#### 5b. \( \_\_\_ + 3 = 12 \)
To find the missing number:
\[ 12 - 3 = 9 \]
So, the answer is:
\[ \boxed{9} \]

#### 6a. \( 11 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 11 = 1 \]
So, the answer is:
\[ \boxed{1} \]

#### 6b. \( \_\_\_ + 7 = 12 \)
To find the missing number:
\[ 12 - 7 = 5 \]
So, the answer is:
\[ \boxed{5} \]

#### 7a. \( 4 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 4 = 8 \]
So, the answer is:
\[ \boxed{8} \]

#### 7b. \( 0 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 0 = 12 \]
So, the answer is:
\[ \boxed{12} \]

#### 8a. \( 8 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 8 = 4 \]
So, the answer is:
\[ \boxed{4} \]

#### 8b. \( \_\_\_ + 2 = 12 \)
To find the missing number:
\[ 12 - 2 = 10 \]
So, the answer is:
\[ \boxed{10} \]

#### 9a. \( 7 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 7 = 5 \]
So, the answer is:
\[ \boxed{5} \]

#### 9b. \( \_\_\_ + 6 = 12 \)
To find the missing number:
\[ 12 - 6 = 6 \]
So, the answer is:
\[ \boxed{6} \]

#### 10a. \( 9 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 9 = 3 \]
So, the answer is:
\[ \boxed{3} \]

#### 10b. \( 2 + \_\_\_ = 12 \)
To find the missing number:
\[ 12 - 2 = 10 \]
So, the answer is:
\[ \boxed{10} \]

Final Answers

\[
\begin{array}{|c|c|}
\hline
\text{1a.} & 2 \\
\text{1b.} & 4 \\
\hline
\text{2a.} & 8 \\
\text{2b.} & 7 \\
\hline
\text{3a.} & 1 \\
\text{3b.} & 12 \\
\hline
\text{4a.} & 11 \\
\text{4b.} & 11 \\
\hline
\text{5a.} & 6 \\
\text{5b.} & 9 \\
\hline
\text{6a.} & 1 \\
\text{6b.} & 5 \\
\hline
\text{7a.} & 8 \\
\text{7b.} & 12 \\
\hline
\text{8a.} & 4 \\
\text{8b.} & 10 \\
\hline
\text{9a.} & 5 \\
\text{9b.} & 6 \\
\hline
\text{10a.} & 3 \\
\text{10b.} & 10 \\
\hline
\end{array}
\]

\(\boxed{2, 4, 8, 7, 1, 12, 11, 11, 6, 9, 1, 5, 8, 12, 4, 10, 5, 6, 3, 10}\)