Find all ordered pairs $(a,b)$, of natural numbers, where $1<a,b\leq 100$, such that
$\frac{1}{\log_{a}{10}}+\frac{1}{\log_{b}{10}}$ is a natural number.
To solve the problem, we need to find all ordered pairs \((a, b)\) of natural numbers, where \(1 < a, b \leq 100\), such that \(\frac{1}{\log_{a}{10}} + \frac{1}{\log_{b}{10}}\) is a natural number.

1. **Rewrite the given expression using the change of base formula:**
   \[
   \frac{1}{\log_{a}{10}} + \frac{1}{\log_{b}{10}}
   \]
   Using the change of base formula, \(\log_{a}{10} = \frac{\log_{10}{10}}{\log_{10}{a}} = \frac{1}{\log_{10}{a}}\) and \(\log_{b}{10} = \frac{1}{\log_{10}{b}}\), we can rewrite the expression as:
   \[
   \frac{1}{\frac{1}{\log_{10}{a}}} + \frac{1}{\frac{1}{\log_{10}{b}}} = \log_{10}{a} + \log_{10}{b}
   \]

2. **Simplify the expression:**
   \[
   \log_{10}{a} + \log_{10}{b} = \log_{10}{(a \cdot b)}
   \]
   We need \(\log_{10}{(a \cdot b)}\) to be a natural number. Let \(k\) be a natural number, then:
   \[
   \log_{10}{(a \cdot b)} = k
   \]
   This implies:
   \[
   a \cdot b = 10^k
   \]

3. **Determine the range of \(k\):**
   Since \(1 < a, b \leq 100\), the maximum value for \(a \cdot b\) is \(100 \cdot 100 = 10000\). Therefore, \(k\) must satisfy:
   \[
   10^k \leq 10000
   \]
   The possible values for \(k\) are \(1, 2, 3, 4\) because \(10^5 = 100000\) exceeds the limit.

4. **Find all pairs \((a, b)\) for each \(k\):**
   - For \(k = 1\):
     \[
     a \cdot b = 10
     \]
     The pairs \((a, b)\) are \((2, 5)\), \((5, 2)\), \((10, 1)\), and \((1, 10)\). However, since \(1 < a, b \leq 100\), the valid pairs are \((2, 5)\) and \((5, 2)\).

   - For \(k = 2\):
     \[
     a \cdot b = 100
     \]
     The pairs \((a, b)\) are \((4, 25)\), \((25, 4)\), \((10, 10)\), \((20, 5)\), and \((5, 20)\).

   - For \(k = 3\):
     \[
     a \cdot b = 1000
     \]
     The pairs \((a, b)\) are \((10, 100)\), \((100, 10)\), \((20, 50)\), \((50, 20)\), \((25, 40)\), and \((40, 25)\).

   - For \(k = 4\):
     \[
     a \cdot b = 10000
     \]
     The pairs \((a, b)\) are \((100, 100)\).

5. **List all valid pairs:**
   Combining all the valid pairs from each \(k\), we get:
   \[
   (2, 5), (5, 2), (4, 25), (25, 4), (10, 10), (20, 5), (5, 20), (10, 100), (100, 10), (20, 50), (50, 20), (25, 40), (40, 25), (100, 100)
   \]

The final answer is \(\boxed{(2, 5), (5, 2), (4, 25), (25, 4), (10, 10), (20, 5), (5, 20), (10, 100), (100, 10), (20, 50), (50, 20), (25, 40), (40, 25), (100, 100)}\).