test.tex

\documentclass{article}
\usepackage{graphicx}
\usepackage{amsmath,amsfonts,amsthm}
\usepackage{calc}
\usepackage[nomessages]{fp}

\newcommand{\testvariable}{ 100 }
\begin{document}

\title{Budget Justification Text}
\author{Andrew Severin}

\maketitle

Putting a variable into a paragraph \testvariable may prove to be more challenging \testvariable then I believe \testvariable

$a + b + \testvariable*10$

\FPeval{result}{round(2*\testvariable,2)} 
\result

\begin{abstract}
The abstract text goes here.
\end{abstract}

\section{Introduction}
Here is the text of your introduction.

%\input{methods}

\begin{equation}
    \label{simple_equation}
    \alpha = \sqrt{ \beta }
\end{equation}

\subsection{Subsection Heading Here}
Write your subsection text here.


\section{Conclusion}
Write your conclusion here.

\end{document}