Arrange the following in ascending order:
$\frac{3}{10} ,\frac{17}{-30} ,\ \frac{7}{15} ,\frac{-11}{20}$
Given :
Given numbers are $\frac{3}{10} ,\frac{17}{-30} =\frac{-17}{30},\ \frac{7}{15} ,\frac{-11}{20}$.
To find :
We have to arrange the given numbers in ascending order.
Solution :
To arrange the given numbers in ascending order we have to first find the LCM of the denominators.
LCM of 10,30,15 and 20 is,
$ \begin{array}{l}
10=2\times 5\
30=2\times 3\times 5\
15=3\times 5\
20=2\times 2\times 5\
\end{array}$
LCM of 10,30,15 and 20 = $2\times 2\times 3\times 5$=60
Therefore,
$\frac{3}{10}=\frac{3\times6}{10\times6}=\frac{18}{60}$
$\frac{-17}{30}=\frac{-17\times2}{30\times2}=\frac{-34}{60}$
$\frac{7}{15}=\frac{7\times4}{15\times4}=\frac{28}{60}$
$\frac{-11}{20}=\frac{-11\times3}{20\times3}=\frac{-33}{60}$
Comparing the numerators,
$-34<-33<18<28$
This implies,
$\frac{-34}{60}<\frac{-33}{60}<\frac{18}{60}<\frac{28}{60}$
Therefore,
$\frac{-17}{30}<\frac{-11}{20}<\frac{3}{10}<\frac{7}{15}$
The given numbers arranged in the ascending order is $\frac{17}{-30} ,\frac{-11}{20}, \frac{3}{10} ,\frac{7}{15}$.
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