Fill in the missing number bonds to 100 using bar models in this math worksheet.

Problem Overview:

The task involves filling in the missing numbers in bar models such that the total of each pair of numbers equals 100. This is a fundamental exercise in understanding number bonds to 100.

Solution Approach:

For each problem, we need to find the missing number that, when added to the given number, results in 100. Mathematically, this can be expressed as:
\[
\text{Missing Number} = 100 - \text{Given Number}
\]

We will solve each problem step by step using this formula.

---

Detailed Solutions:

#### 1)
\[
\begin{array}{c|c}
100 & \\
\hline
65 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 65 = 35
\]
\[
\boxed{35}
\]

#### 2)
\[
\begin{array}{c|c}
100 & \\
\hline
74 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 74 = 26
\]
\[
\boxed{26}
\]

#### 3)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 21 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 21 = 79
\]
\[
\boxed{79}
\]

#### 4)
\[
\begin{array}{c|c}
100 & \\
\hline
38 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 38 = 62
\]
\[
\boxed{62}
\]

#### 5)
\[
\begin{array}{c|c}
100 & \\
\hline
56 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 56 = 44
\]
\[
\boxed{44}
\]

#### 6)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 42 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 42 = 58
\]
\[
\boxed{58}
\]

#### 7)
\[
\begin{array}{c|c}
100 & \\
\hline
17 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 17 = 83
\]
\[
\boxed{83}
\]

#### 8)
\[
\begin{array}{c|c}
100 & \\
\hline
85 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 85 = 15
\]
\[
\boxed{15}
\]

#### 9)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 53 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 53 = 47
\]
\[
\boxed{47}
\]

#### 10)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 26 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 26 = 74
\]
\[
\boxed{74}
\]

#### 11)
\[
\begin{array}{c|c}
100 & \\
\hline
67 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 67 = 33
\]
\[
\boxed{33}
\]

#### 12)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 79 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 79 = 21
\]
\[
\boxed{21}
\]

#### 13)
\[
\begin{array}{c|c}
100 & \\
\hline
43 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 43 = 57
\]
\[
\boxed{57}
\]

#### 14)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 54 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 54 = 46
\]
\[
\boxed{46}
\]

#### 15)
\[
\begin{array}{c|c}
100 & \\
\hline
? & 18 \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 18 = 82
\]
\[
\boxed{82}
\]

#### 16)
\[
\begin{array}{c|c}
100 & \\
\hline
7 & ? \\
\end{array}
\]
\[
\text{Missing Number} = 100 - 7 = 93
\]
\[
\boxed{93}
\]

---

Final Answer:

\[
\boxed{35, 26, 79, 62, 44, 58, 83, 15, 47, 74, 33, 21, 57, 46, 82, 93}
\]