Subtraction worksheet featuring nine two-digit subtraction problems arranged in a grid, designed for educational practice.

The task involves solving a series of subtraction problems. Let's solve each problem step by step.

Problem 1:

\[
\begin{array}{r}
31 \\
-22 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 2\). Since 1 is less than 2, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 3 to 2 and 1 to 11.
- Now, \(11 - 2 = 9\).
2. Subtract the tens place: \(2 - 2 = 0\).

So, the result is:
\[
\begin{array}{r}
31 \\
-22 \\
\hline
09 \\
\end{array}
\]

Problem 2:

\[
\begin{array}{r}
21 \\
-13 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 3\). Since 1 is less than 3, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 2 to 1 and 1 to 11.
- Now, \(11 - 3 = 8\).
2. Subtract the tens place: \(1 - 1 = 0\).

So, the result is:
\[
\begin{array}{r}
21 \\
-13 \\
\hline
08 \\
\end{array}
\]

Problem 3:

\[
\begin{array}{r}
91 \\
-52 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 2\). Since 1 is less than 2, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 9 to 8 and 1 to 11.
- Now, \(11 - 2 = 9\).
2. Subtract the tens place: \(8 - 5 = 3\).

So, the result is:
\[
\begin{array}{r}
91 \\
-52 \\
\hline
39 \\
\end{array}
\]

Problem 4:

\[
\begin{array}{r}
81 \\
-43 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 3\). Since 1 is less than 3, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 8 to 7 and 1 to 11.
- Now, \(11 - 3 = 8\).
2. Subtract the tens place: \(7 - 4 = 3\).

So, the result is:
\[
\begin{array}{r}
81 \\
-43 \\
\hline
38 \\
\end{array}
\]

Problem 5:

\[
\begin{array}{r}
61 \\
-54 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 4\). Since 1 is less than 4, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 6 to 5 and 1 to 11.
- Now, \(11 - 4 = 7\).
2. Subtract the tens place: \(5 - 5 = 0\).

So, the result is:
\[
\begin{array}{r}
61 \\
-54 \\
\hline
07 \\
\end{array}
\]

Problem 6:

\[
\begin{array}{r}
51 \\
-34 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 4\). Since 1 is less than 4, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 5 to 4 and 1 to 11.
- Now, \(11 - 4 = 7\).
2. Subtract the tens place: \(4 - 3 = 1\).

So, the result is:
\[
\begin{array}{r}
51 \\
-34 \\
\hline
17 \\
\end{array}
\]

Problem 7:

\[
\begin{array}{r}
41 \\
-39 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 9\). Since 1 is less than 9, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 4 to 3 and 1 to 11.
- Now, \(11 - 9 = 2\).
2. Subtract the tens place: \(3 - 3 = 0\).

So, the result is:
\[
\begin{array}{r}
41 \\
-39 \\
\hline
02 \\
\end{array}
\]

Problem 8:

\[
\begin{array}{r}
91 \\
-35 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 5\). Since 1 is less than 5, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 9 to 8 and 1 to 11.
- Now, \(11 - 5 = 6\).
2. Subtract the tens place: \(8 - 3 = 5\).

So, the result is:
\[
\begin{array}{r}
91 \\
-35 \\
\hline
56 \\
\end{array}
\]

Problem 9:

\[
\begin{array}{r}
71 \\
-39 \\
\hline
\end{array}
\]

1. Subtract the ones place: \(1 - 9\). Since 1 is less than 9, we need to borrow 1 from the tens place.
- Borrowing 1 from the tens place changes 7 to 6 and 1 to 11.
- Now, \(11 - 9 = 2\).
2. Subtract the tens place: \(6 - 3 = 3\).

So, the result is:
\[
\begin{array}{r}
71 \\
-39 \\
\hline
32 \\
\end{array}
\]

Final Answers:

\[
\boxed{
\begin{array}{r}
31 \\
-22 \\
\hline
09 \\
\end{array}
\quad
\begin{array}{r}
21 \\
-13 \\
\hline
08 \\
\end{array}
\quad
\begin{array}{r}
91 \\
-52 \\
\hline
39 \\
\end{array}
\quad
\begin{array}{r}
81 \\
-43 \\
\hline
38 \\
\end{array}
\quad
\begin{array}{r}
61 \\
-54 \\
\hline
07 \\
\end{array}
\quad
\begin{array}{r}
51 \\
-34 \\
\hline
17 \\
\end{array}
\quad
\begin{array}{r}
41 \\
-39 \\
\hline
02 \\
\end{array}
\quad
\begin{array}{r}
91 \\
-35 \\
\hline
56 \\
\end{array}
\quad
\begin{array}{r}
71 \\
-39 \\
\hline
32 \\
\end{array}
}
\]