Complete the Decimal Expression: 1.3 = ?

To solve this problem, we'll follow these steps:

• Step 1: Identify the integer and decimal parts of $1.3$.
• Step 2: Convert the decimal $0.3$ to a fraction.
• Step 3: Combine the integer and fractional parts into a mixed number.

Let’s work through each step:
Step 1: The integer part of $1.3$ is $1$, and the decimal part is $0.3$.
Step 2: The decimal $0.3$ can be converted to the fraction $\frac{3}{10}$ because it signifies three-tenths.
Step 3: Combining the integer part with the fractional part, we get the mixed number $1\frac{3}{10}$.

Therefore, the solution to the problem is $1\frac{3}{10}$.