I want to write a question in which I have a bar on top of a number or letter to represent a recurring digit. however, I can't find any options to write the particular digit, even when I search the help center for Latex, which is supposed to be used to edit any math statements. What will I use to write it ?
Any suggestions will be appreciated.
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1 Answer
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To give the question an answer so it can be accepted: you can use $\overline{...}$
to get a bar over any letter or digit or group thereof.

1$\begingroup$ Alrernatively,
$\bar{5}$
$\bar{5}$ $\endgroup$ Commented Jun 25, 2023 at 12:36 
1$\begingroup$ @TheAmplitwist, re, good point! Let's put them side by side to see the subtle difference: $\overline5\bar5$
\overline5\bar5
. It's less subtle when overlining groups: $\overline5\overline6\overline{56}\bar5\bar6\bar{56}$\overline5\overline6\overline{56}\bar{56}\bar5\bar6
. (I don't see a rendering difference between\overline5\overline6
and\overline{56}
, though the widths probably differ slightly. I include\bar{56}
for parallelism, but, of course, it is almost certainly not what is desired.) $\endgroup$– LSpiceCommented Jun 25, 2023 at 18:55 
1
$\overline{5}$
$=\overline{5}$. $\endgroup$\underline
$\endgroup$$\overline{5}$
${}= \overline{5}$`$\overline{5}$` ${}= \overline{5}$
. $\endgroup$