Express 811 as a repeating decimal. Mark the cycle of repeating digits with a bar.(

To express 811 as a repeating decimal, we first note that 811 is an integer, which can be represented as a decimal without any fractional part:

\[ 811 = 811.0 \]

If you were looking for a way to express it with a repeating decimal in some form, we could represent it as:

\[ 811.000\ldots \]

Although this decimation does not involve any actual repeating digits (since it’s purely zeros), it can still be written as:

\[ 811.0\overline{0} \]

Here, the bar denotes that the digit 0 repeats indefinitely.

Thus, the expression for 811 as a repeating decimal is:

\[ 811.0\overline{0} \]