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I would like to know if we could write numbers as given in this maths website with dashes below it.

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    $\begingroup$ Do you mean something like $\underline{8}\cdot\underline{7}$ $\underline{8}\cdot\underline{7}$? $\endgroup$ – Martin Sleziak Jan 1 '16 at 10:32
  • $\begingroup$ @MartinSleziak:Yes absolutely that. $\endgroup$ – justin Jan 1 '16 at 10:47
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    $\begingroup$ Sometimes these lines don't line up: $\underline{x}\cdot\underline{y}\cdot\underline{z}$. $\endgroup$ – GEdgar Jan 1 '16 at 14:29
  • $\begingroup$ @GEdgar: Write \underline{\mathstrut x}, and the underlines will line up: $\underline{\mathstrut x}\cdot\underline{\mathstrut y}\cdot\underline{\mathstrut z}$. $\endgroup$ – Christian Blatter Jan 3 '16 at 18:33
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As Martin Sleziak suggested in a comment, use \underline{} which will produce $$\underline{{\text{blahblah}}}.$$

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