Solution 1.2:1b
From Förberedande kurs i matematik 1
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- | {{ | + | 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, |
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+ | <math>\frac{2\centerdot 5}{7\centerdot 5}-\frac{1\centerdot 7}{5\centerdot 7}=\frac{10}{35}-\frac{7}{35}</math> | ||
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+ | Then the numerators can be subtracted: | ||
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+ | <math>\frac{10}{35}-\frac{7}{35}=\frac{10-7}{35}=\frac{3}{35}</math> |
Revision as of 11:32, 11 September 2008
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\centerdot 5}{7\centerdot 5}-\frac{1\centerdot 7}{5\centerdot 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}