\documentclass[10pt,a4paper]{article}

% Packages
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\usepackage{multicol}           % Allows multicols in tables
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\usepackage{hhline}             % Border under tables
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\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{missvargas95}
\pdfinfo{
  /Title (chemistry-final.pdf)
  /Creator (Cheatography)
  /Author (missvargas95)
  /Subject (Chemistry Final Cheat Sheet)
}

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% This two commands together give roughly
% the right line height in the tables
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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
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% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
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\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Chemistry Final Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{missvargas95} via \textcolor{DarkBackground}{\uline{cheatography.com/161688/cs/33883/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}missvargas95 \\
  \uline{cheatography.com/missvargas95} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 29th August, 2022.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Sig Fig Rules}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{To determine the number of significant figures in a number use the following 3 rules:} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{1. Non-zero digits are always significant} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{2. Any zeros between two significant digits are significant} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{Example: .500 or .632000 the zeros are significant  .006 or .000968 the zeros are NOT significant} \tn 
% Row Count 8 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{For addition and subtraction use the following rules:} \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{1.Count the number of significant figures in the decimal portion ONLY of each number in the problem} \tn 
% Row Count 13 (+ 3)
% Row 6
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\mymulticolumn{1}{x{3.833cm}}{2.Add or subtract in the normal fashion} \tn 
% Row Count 14 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{3.Your final answer may have no more significant figures to the right of the decimal than the LEAST number of significant figures in any number in the problem.} \tn 
% Row Count 18 (+ 4)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{For multiplication and division use the following rule:} \tn 
% Row Count 20 (+ 2)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{1.The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer. (You are now looking at the entire number, not just the decimal portion) This means you have to be able to recognize significant figures in order to use this rule} \tn 
% Row Count 27 (+ 7)
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{Example: 5.26 has 3 significant figures -\textgreater{} 6.1 has 2 significant figures} \tn 
% Row Count 29 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{2.4264 cm} p{0.3033 cm} p{0.3033 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{3.833cm}}{\bf\textcolor{white}{Method for conversions}}  \tn
% Row 0
\SetRowColor{LightBackground}
\#unit1 x \#unit (converting to) / \#unit1 & tera & 10\textasciicircum{}12 \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
cancel like units & giga & 10\textasciicircum{}9 \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
then multiply and divide then you get your answer with new units & mega & 10\textasciicircum{}6 \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
 & kilo & 10\textasciicircum{} \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
 & centi &  \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
 & milli &  \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
 & micro &  \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
 & nano &  \tn 
% Row Count 13 (+ 1)
% Row 8
\SetRowColor{LightBackground}
 & pico &  \tn 
% Row Count 14 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}