Gujarat BoardEnglish MediumSTD 7MATHSRational Numbers2 Marks
Question
Find $\frac{7}{24}-\frac{17}{36}$
✓
Answer
As the denominators are different we find $LCM$ of $24 \& 36$
$\frac{7}{24}-\frac{17}{36}=\frac{7}{24}+\frac{(-17)}{36}$
$LCM$ of $24$ and $36$ is $72.$
$7\over 24$=$7\times3\over 24\times3$=$21\over 72$
$-17\over 36$=$-17\times 2\over 36\times2$=$-34\over 72$
Thus, $\frac{7}{24}+\frac{(-17)}{36}=\frac{21}{72}+\frac{(-34)}{72}$
= $\frac{21+(-34)}{72}=\frac{-13}{72}$
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