Express 2.3: Converting Decimal to Different Number Forms

To convert $2.3$ to a mixed number, follow these steps:

• Step 1: Identify the whole number part of the decimal. Here, the whole number is $2$.
• Step 2: Convert the decimal part $0.3$ into a fraction. The decimal $0.3$ can be viewed as $\frac{3}{10}$ because $0.3$ represents 3 tenths.
• Step 3: Combine the whole number and the fractional part to write the mixed number as $2\frac{3}{10}$.

This correctly converts the decimal $2.3$ into the mixed number $2\frac{3}{10}$.

Therefore, the correct answer is $2\frac{3}{10}$.