To express \( \frac{8}{10} \) as a decimal, we can simplify it first:
\[ \frac{8}{10} = 0.8 \]
Since \( 0.8 \) is a terminating decimal, it does not have repeating digits. Therefore, \( \frac{8}{10} \) can be represented as:
\[ 0.8 \]
If you are specifically looking for a repeating decimal representation, you might express it as \( 0.8000... \), but conventionally, this is still simply written as \( 0.8 \). There are no repeating digits in this case to mark with a bar.
If you meant a fraction that creates a repeating decimal, such as \( \frac{8}{9} \), it would be expressed as \( 0.\overline{8} \). Let me know if you meant something different!