$13$ fractions are corrected by using each of the numbers $1,2,...,26$ once.[b]Example:[/b]$\frac{12}{5},\frac{18}{26}.... $
What is the maximum number of fractions which are integers?
To determine the maximum number of fractions that can be integers when using each of the numbers \(1, 2, \ldots, 26\) exactly once, we need to consider the conditions under which a fraction \(\frac{a}{b}\) is an integer. Specifically, \(\frac{a}{b}\) is an integer if and only if \(a\) is divisible by \(b\).

1. **Identify the prime numbers between 1 and 26:**
   The prime numbers in this range are \(2, 3, 5, 7, 11, 13, 17, 19, 23\).

2. **Consider the divisibility condition:**
   For \(\frac{a}{b}\) to be an integer, \(a\) must be a multiple of \(b\). This means that for each \(b\), we need to find an \(a\) such that \(a = kb\) for some integer \(k\).

3. **Pair the numbers to form integers:**
   We need to pair the numbers \(1, 2, \ldots, 26\) such that the resulting fractions are integers. Let's start with the largest numbers and work our way down:
   - \(26/1 = 26\)
   - \(24/2 = 12\)
   - \(21/3 = 7\)
   - \(20/4 = 5\)
   - \(25/5 = 5\)
   - \(18/6 = 3\)
   - \(14/7 = 2\)
   - \(16/8 = 2\)
   - \(27/9 = 3\)
   - \(30/10 = 3\)
   - \(22/11 = 2\)
   - \(26/13 = 2\)

4. **Check for remaining numbers:**
   After pairing the numbers as above, we need to check if there are any remaining numbers that cannot be paired to form an integer fraction. The remaining numbers are \(17, 19, 23\), which are all prime and cannot be paired with any other number to form an integer fraction.

5. **Count the number of integer fractions:**
   From the pairs above, we have formed 12 integer fractions. Since the remaining numbers \(17, 19, 23\) cannot be paired to form integer fractions, it is impossible to form 13 integer fractions.

Therefore, the maximum number of fractions that can be integers is 12.

The final answer is \(\boxed{12}\).