Bigger fractions without using \dfrac

Question

Is there any way to make fractions bigger? I know one can use \dfrac but is there any code I can use in the document preamble to make all fractions bigger?

Answer 1

\let\oldfrac\frac
\let\frac\dfrac

will make \frac be defined to be the same as \dfrac and makes \oldfrac available if you need it.

Answer 2

See if you like this; normal fractions are presented in displaystyle size. This will mean that lines crowd together, so you'll need to fix the spacing of the lines.

\documentclass{article}
\usepackage[english]{babel}
\everymath{\displaystyle}
\linespread{2}%controls the spacing between lines. Bigger fractions means crowded lines
\pagestyle{empty}
\begin{document}
 Here is my text with normal fractions
$\frac{3}{4}$ this will cause lines to look crowd together unless you space them differently $\frac{1}{2}$.
\end{document}