\documentclass[10pt]{article}
\usepackage{amsmath, amsthm, amssymb, amsfonts, graphicx}

\begin{document}

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\title{REU DEMO TEX presentation}
\author
{
Hannah Mahan\thanks{your info.}
  \and
Haseena Ahmed\thanks{Department of Mathematics, Iowa State
University, (haseena@iastate.edu)}
  \and
Stephen Smith\thanks{your info.} }
\maketitle

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\begin{center}
\today
\end{center}

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\begin{abstract}
This is the abstract of my paper - let's see how it looks.
\end{abstract}

%\keywords{Keywords: REU, math, testing, cool}

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\section{Numerical Method 1}\label{sectiontwo}
This is the Numerical Method 1 section. It describes how to find
the derivative of a function using some numerical methods.

\section{Numerical Method 2}

\subsection{Algorithm} This method is used to find the integral of a
function numerically. In section \ref{sectiontwo} we described how
to find the derivative of a function.

\subsubsection{Algorithm 1} This is Algorithm 1 and it is very
efficient. Details of this algorithm comes from the paper
\cite{one}.

\subsubsection{Algorithm 2} This is Algorithm 2 and it is very
efficient. Details of this algorithm comes from the paper
\cite{two}.

This is without displaystyle $\lim_{x \rightarrow 5} 2x = 10$

This is with displaystyle, isn't it pretty $\displaystyle \lim_{x
\rightarrow 5} 2x = 10 \text{ for all } x$

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\begin{thebibliography}{99}
\bibitem{one}
Reference 1
\bibitem{two}
Reference 2
\end{thebibliography}

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\end{document}
