From Förberedande kurs i matematik 1

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-	{{NAVCONTENT_START}}	+	We calculate the double fraction by multiplying top and bottom by the reciprocal of the denominator,
-	<center> [[Image:1_2_4a.gif]] </center>	+
-	{{NAVCONTENT_STOP}}	+	{{Displayed math||<math>\frac{\displaystyle\ \frac{3}{5}\vphantom{\Biggl(}\ }{\displaystyle\ \frac{7}{10}\vphantom{\Biggl(}\ } = \frac{\displaystyle\frac{3}{5}\cdot\frac{10}{7}\vphantom{\Biggl(}}{\displaystyle \frac{\rlap{/}7}{\rlap{\,/}10}\cdot \frac{\rlap{\,/}10}{\rlap{/}7}\vphantom{\Biggl(}} = \frac{3}{5}\cdot \frac{10}{7}\,</math>.}}
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		+	The expression can now be simplified further by removing the common factor 5,
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		+	{{Displayed math||<math>\frac{3}{5}\cdot \frac{10}{7} = \frac{3}{\rlap{/}5}\cdot \frac{2\cdot {}\rlap{/}5}{7} = \frac{3\cdot 2}{7} = \frac{6}{7}\,</math>.}}

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Current revision

We calculate the double fraction by multiplying top and bottom by the reciprocal of the denominator,

\displaystyle \frac{\displaystyle\ \frac{3}{5}\vphantom{\Biggl(}\ }{\displaystyle\ \frac{7}{10}\vphantom{\Biggl(}\ } = \frac{\displaystyle\frac{3}{5}\cdot\frac{10}{7}\vphantom{\Biggl(}}{\displaystyle \frac{\rlap{/}7}{\rlap{\,/}10}\cdot \frac{\rlap{\,/}10}{\rlap{/}7}\vphantom{\Biggl(}} = \frac{3}{5}\cdot \frac{10}{7}\,.

The expression can now be simplified further by removing the common factor 5,

\displaystyle \frac{3}{5}\cdot \frac{10}{7} = \frac{3}{\rlap{/}5}\cdot \frac{2\cdot {}\rlap{/}5}{7} = \frac{3\cdot 2}{7} = \frac{6}{7}\,.