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\def \HeadingQuestions {\section*{\Large Name: \underline{\hspace{8cm}} \hfill Date: \underline{\hspace{3cm}}} \vspace{-3mm}
{Addition of decimals: Questions} \vspace{1pt}\hrule}

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%
\begin{document}
\HeadingQuestions
\vspace{-5mm}
\begin{multicols}{3}
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\vspace{-1pt}\columnbreak  % Break column after 30 questions
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\vspace{-1pt}
\end{multicols}
\end{document}