Let $n$ be a five digit number (whose first digit is non-zero) and let $m$ be the four digit number formed from $n$ by removing its middle digit. Determine all $n$ such that $n/m$ is an integer.
1. **Define the numbers \( n \) and \( m \):**
   Let \( n = 10000a + 1000b + 100c + 10d + e \) be a five-digit number where \( a \neq 0 \).
   Let \( m = 1000a + 100b + 10d + e \) be the four-digit number formed by removing the middle digit \( c \) from \( n \).

2. **Express the condition \( \frac{n}{m} \) being an integer:**
   Since \( m \mid n \), it follows that \( m \mid (n - 10m) \).

3. **Simplify \( n - 10m \):**
   \[
   n - 10m = (10000a + 1000b + 100c + 10d + e) - 10(1000a + 100b + 10d + e)
   \]
   \[
   = 10000a + 1000b + 100c + 10d + e - 10000a - 1000b - 100d - 10e
   \]
   \[
   = 100c - 90d - 9e
   \]
   Therefore, \( m \mid (100c - 90d - 9e) \).

4. **Case 1: The quotient \( k \) of \( \frac{n}{m} \) is 1:**
   \[
   100c - 90d - 9e = 0 \implies 100c = 90d + 9e
   \]
   \[
   100c = 9(10d + e)
   \]
   Since \( 9 \nmid 100 \), \( 9 \mid c \). Therefore, \( c \) must be either 0 or 9.

   - **Subcase 1.1: \( c = 0 \):**
     \[
     90d + 9e = 0 \implies 10d + e = 0
     \]
     Since \( 0 \leq d, e \leq 9 \), the only solution is \( d = 0 \) and \( e = 0 \).
     Thus, \( c = d = e = 0 \), and \( n = 10000a + 1000b \), which means \( n \) is of the form \( \overline{ab000} \).

   - **Subcase 1.2: \( c = 9 \):**
     \[
     90d + 9e = 900 \implies 10d + e = 100
     \]
     This is a contradiction since \( 10d + e \leq 99 \). Therefore, there are no solutions in this subcase.

5. **Case 2: \( k \geq 1 \):**
   \[
   100c = (1000k)a + (100k)b + (10k + 90)d + (k + 9)e
   \]
   Since \( c \leq 9 \), the left-hand side (LHS) is at most 900. However, the right-hand side (RHS) is at least 1000 when \( a \) and \( k \) are both minimal at 1. Therefore, there are no solutions in this case.

To sum up, the only solution is of the form \( \boxed{n = \overline{ab000}} \), i.e., \( m \mid n \) if \( n \) is a multiple of 1000.