3 Digit Addition- Fill in the Missing Numbers Math Worksheet ... - Free Printable

To solve the problem, we need to fill in the missing digits in each addition problem. Let's go through each one step by step.

First Row:

1. Problem 1:
\[
\begin{array}{c@{}c@{}c}
& 2 & 3 & 1 \\
+ & 4 & 2 & 5 \\
\hline
& 6 & 5 & 6 \\
\end{array}
\]
- This is already solved and correct.

2. Problem 2:
\[
\begin{array}{c@{}c@{}c}
& ? & 7 & 1 \\
+ & 1 & 2 & ? \\
\hline
& 6 & 9 & 2 \\
\end{array}
\]
- Ones place: \(1 + ? = 2\). So, the missing digit is \(1\).
- Tens place: \(7 + 2 = 9\). This is correct.
- Hundreds place: \(? + 1 = 6\). So, the missing digit is \(5\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 5 & 7 & 1 \\
+ & 1 & 2 & 1 \\
\hline
& 6 & 9 & 2 \\
\end{array}
\]

3. Problem 3:
\[
\begin{array}{c@{}c@{}c}
& 1 & 0 & 1 \\
+ & 4 & ? & 8 \\
\hline
& ? & 4 & 9 \\
\end{array}
\]
- Ones place: \(1 + 8 = 9\). This is correct.
- Tens place: \(0 + ? = 4\). So, the missing digit is \(4\).
- Hundreds place: \(1 + 4 = 5\). So, the missing digit is \(5\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 1 & 0 & 1 \\
+ & 4 & 4 & 8 \\
\hline
& 5 & 4 & 9 \\
\end{array}
\]

Second Row:

4. Problem 4:
\[
\begin{array}{c@{}c@{}c}
& 2 & 4 & ? \\
+ & ? & ? & 3 \\
\hline
& 6 & 6 & 4 \\
\end{array}
\]
- Ones place: \(? + 3 = 4\). So, the missing digit is \(1\).
- Tens place: \(4 + ? = 6\). So, the missing digit is \(2\).
- Hundreds place: \(2 + ? = 6\). So, the missing digit is \(4\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 2 & 4 & 1 \\
+ & 4 & 2 & 3 \\
\hline
& 6 & 6 & 4 \\
\end{array}
\]

5. Problem 5:
\[
\begin{array}{c@{}c@{}c}
& 3 & 3 & 1 \\
+ & ? & ? & 4 \\
\hline
& ? & 5 & 5 \\
\end{array}
\]
- Ones place: \(1 + 4 = 5\). This is correct.
- Tens place: \(3 + ? = 5\). So, the missing digit is \(2\).
- Hundreds place: \(3 + ? = ?\). Since there is no carry-over from the tens place, the missing digit is \(0\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 3 & 3 & 1 \\
+ & 0 & 2 & 4 \\
\hline
& 3 & 5 & 5 \\
\end{array}
\]

6. Problem 6:
\[
\begin{array}{c@{}c@{}c}
& 4 & ? & 1 \\
+ & ? & 0 & 8 \\
\hline
& 7 & 8 & 9 \\
\end{array}
\]
- Ones place: \(1 + 8 = 9\). This is correct.
- Tens place: \(? + 0 = 8\). So, the missing digit is \(8\).
- Hundreds place: \(4 + ? = 7\). So, the missing digit is \(3\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 4 & 8 & 1 \\
+ & 3 & 0 & 8 \\
\hline
& 7 & 8 & 9 \\
\end{array}
\]

Third Row:

7. Problem 7:
\[
\begin{array}{c@{}c@{}c}
& 6 & 7 & 1 \\
+ & ? & ? & 0 \\
\hline
& 8 & 8 & ? \\
\end{array}
\]
- Ones place: \(1 + 0 = 1\). So, the missing digit is \(1\).
- Tens place: \(7 + ? = 8\). So, the missing digit is \(1\).
- Hundreds place: \(6 + ? = 8\). So, the missing digit is \(2\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 6 & 7 & 1 \\
+ & 2 & 1 & 0 \\
\hline
& 8 & 8 & 1 \\
\end{array}
\]

8. Problem 8:
\[
\begin{array}{c@{}c@{}c}
& ? & 2 & 1 \\
+ & 1 & ? & 8 \\
\hline
& 2 & 4 & ? \\
\end{array}
\]
- Ones place: \(1 + 8 = 9\). So, the missing digit is \(9\).
- Tens place: \(2 + ? = 4\). So, the missing digit is \(2\).
- Hundreds place: \(? + 1 = 2\). So, the missing digit is \(1\).
- Final answer:
\[
\begin{array}{c@{}c@{}c}
& 1 & 2 & 1 \\
+ & 1 & 2 & 8 \\
\hline
& 2 & 4 & 9 \\
\end{array}
\]

9. Problem 9:
\[
\begin{array}{c@{}c@{}c}
& 7 & 5 & 1 \\
+ & ? & ? & ? \\
\hline
& 4 & 7 & 1 \\
\]
- This problem seems incorrect because adding any positive number to \(751\) cannot result in \(471\). There might be a typo or error in the problem statement.

Final Answers:

\[
\boxed{
\begin{array}{c}
571 + 121 = 692 \\
101 + 448 = 549 \\
241 + 423 = 664 \\
331 + 024 = 355 \\
481 + 308 = 789 \\
671 + 210 = 881 \\
121 + 128 = 249 \\
\end{array}
}
\]