Insert one rational number between `2 "and" 3`.

Answer

To insert one rational number between 2 and 3, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the two numbers**: We have the numbers 2 and 3.

2. **Find the average of the two numbers**: To find a rational number between 2 and 3, we can calculate the average of these two numbers. The formula for the average of two numbers \( x \) and \( y \) is:
\[ \text{Average} = \frac{x + y}{2} \]
Here, \( x = 2 \) and \( y = 3 \).

3. **Calculate the average**:
\[ \text{Average} = \frac{2 + 3}{2} = \frac{5}{2} \]

4. **Convert to decimal form**: The fraction \( \frac{5}{2} \) can also be expressed as a decimal:
\[ \frac{5}{2} = 2.5 \]

5. **Verify that it is a rational number**: A rational number is defined as a number that can be expressed in the form \( \frac{p}{q} \), where \( p \) is an integer and \( q \) is a non-zero integer. Here, \( \frac{5}{2} \) meets this criterion since 5 is an integer and 2 is a non-zero integer.

### Final Answer:
The rational number between 2 and 3 is \( \frac{5}{2} \) or 2.5.