Adding page number

Question

I searched some of the questions related with this subject on TeX.SX., but i couldn't manage to understand which one fits for me. I want page number to be displayed on all pages of the document; table of contents page, list of figures page, chapters' first pages ... I have added some part of the code I use :

\documentclass[12pt,twoside,fleqn]{report}
\usepackage{geometry}
\usepackage{fancyhdr}
\usepackage{tocloft}
\geometry{ a4paper, total={210mm,297mm}, left=27.5mm, right=27.5mm, top=30mm, bottom=20mm}
\pagestyle{fancy}
\fancyhead{}
\fancyfoot{}
\fancyhead[LE]{\thepage}
\fancyhead[RO]{\thepage}
\newlength{\spacelength}
\settowidth{\spacelength}{\normalfont\ }
\renewcommand{\headrulewidth}{0pt}
\addtocontents{toc}{~\hfill\textbf{Page}\par}
\addtocontents{toc}{\protect\renewcommand*\protect\addvspace[1]{}}
\setlength{\cftbeforetoctitleskip}{-1.5em}
\renewcommand\cftchapaftersnum{.}
\renewcommand{\cftpartleader}{\cftdotfill{\cftdotsep}} 
\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
\renewcommand{\cftsecleader}{\cftdotfill{\cftdotsep}}
\begin{document}
\pagenumbering{roman}
Some text..
\newpage
Some Text.
\newpage
\begin{center}
\tableofcontents{}
\end{center}
\chapter{IntroductioN}
\pagenumbering{arabic}
Some Text..
\newpage 
\section{section}
Some text..
\end{document}

Answer 1

On chapter pages, the plain page style is used by default. You have to either redefine the plain page style using fancyhdr or (the easier one) make plain equal to `fancy like

\makeatletter
\let\ps@plain\ps@fancy
\makeatother

Your code:

\documentclass[12pt,twoside,fleqn]{report}
\usepackage{geometry}
\usepackage{fancyhdr}
\usepackage{tocloft}
\geometry{ a4paper, total={210mm,297mm}, left=27.5mm, right=27.5mm, top=30mm, bottom=20mm}
\pagestyle{fancy}
\fancyhead{}
\fancyfoot{}
\fancyhead[LE]{\thepage}
\fancyhead[RO]{\thepage}
\newlength{\spacelength}
\settowidth{\spacelength}{\normalfont\ }
\renewcommand{\headrulewidth}{0pt}
\addtocontents{toc}{~\hfill\textbf{Page}\par}
\addtocontents{toc}{\protect\renewcommand*\protect\addvspace[1]{}}
\setlength{\cftbeforetoctitleskip}{-1.5em}
\renewcommand\cftchapaftersnum{.}
\renewcommand{\cftpartleader}{\cftdotfill{\cftdotsep}}
\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
\renewcommand{\cftsecleader}{\cftdotfill{\cftdotsep}}

\makeatletter
\let\ps@plain\ps@fancy
\makeatother
\begin{document}
\pagenumbering{roman}
Some text..
\newpage
Some Text.
\newpage
\begin{center}
\tableofcontents{}
\end{center}
\chapter{IntroductioN}
\pagenumbering{arabic}
Some Text..
\newpage
\section{section}
Some text..
\end{document}

Answer 2

A quick and dirty method is to remove \thispagestyle{plain} from \tableofcontents or the \chapter start - up pages using a \xpatchcmd from xpatch package.

\documentclass[12pt,twoside,fleqn]{report}

\usepackage{xpatch}%
\usepackage{geometry}
\usepackage{fancyhdr}
\usepackage{tocloft}
\geometry{ a4paper, total={210mm,297mm}, left=27.5mm, right=27.5mm, top=30mm, bottom=20mm}
\pagestyle{fancy}
\fancyhead{}
\fancyfoot{}
\fancyhead[LE]{\thepage}
\fancyhead[RO]{\thepage}
\newlength{\spacelength}
\settowidth{\spacelength}{\normalfont\ }
\renewcommand{\headrulewidth}{0pt}
\addtocontents{toc}{~\hfill\textbf{Page}\par}
\addtocontents{toc}{\protect\renewcommand*\protect\addvspace[1]{}}
\setlength{\cftbeforetoctitleskip}{-1.5em}
\renewcommand\cftchapaftersnum{.}
\renewcommand{\cftpartleader}{\cftdotfill{\cftdotsep}} 
\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
\renewcommand{\cftsecleader}{\cftdotfill{\cftdotsep}}


\xpatchcmd{\tableofcontents}{\thispagestyle{plain}}{}{}

\makeatletter
\xpatchcmd{\@chapter}{\thispagestyle{plain}}{}{}
\makeatother

\begin{document}
\pagenumbering{roman}
Some text..
\newpage
Some Text.
\newpage
\begin{center}
\tableofcontents{}
\end{center}
\chapter{IntroductioN}
\pagenumbering{arabic}
Some Text..
\newpage 
\section{section}
Some text..
\end{document}