From Förberedande kurs i matematik 1

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-	{{NAVCONTENT_START}}	+	Subtraction works in the same way as addition. First, we multiply the top and bottom of each fraction by the other fraction's denominator so that they have a common denominator,
-	<center> [[Image:1_2_1b.gif]] </center>	+
-	{{NAVCONTENT_STOP}}	+	{{Displayed math||<math>\frac{2\cdot 5}{7\cdot 5}-\frac{1\cdot 7}{5\cdot 7}=\frac{10}{35}-\frac{7}{35}\,</math>.}}
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		+	Then the numerators can be subtracted,
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		+	{{Displayed math||<math>\frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}\,</math>.}}

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Current revision

Subtraction works in the same way as addition. First, we multiply the top and bottom of each fraction by the other fraction's denominator so that they have a common denominator,

\displaystyle \frac{2\cdot 5}{7\cdot 5}-\frac{1\cdot 7}{5\cdot 7}=\frac{10}{35}-\frac{7}{35}\,.

Then the numerators can be subtracted,

\displaystyle \frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}\,.