In 7.86, the digit 8 is in the tenths place.<br><br>
&bull; The decimal 7.86 means 7 ones + 8 tenths + 6 hundredths.<br>
&bull; The value of the digit 8 is 8 tenths, which is \( \frac{8}{10} \).<br><br>
Final Answer: \( \frac{8}{10} \)