Question

Find : 
(i)$\frac{7}{24}$-$\frac{17}{36}$
(ii) $\frac{5}{63}$-($-\frac{6}{21}$)
(iii) -$\frac{6}{13}$-(-$\frac{7}{15}$)
(iv) -$\frac{3}{8}$-$\frac{7}{11}$
(v)$-\frac{21}{9}$-6

Answer 1

(i) $\frac{7}{24}$-$\frac{17}{36}$
L.C.M of 24 and 36 is 72.
$\frac{7}{24}$-$\frac{17}{36}$ = $\frac{7\times3}{24\times3}-\frac{17\times2}{36\times2}$ = $\frac{21}{72}$= -$\frac{13}{72}$

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(ii) $\frac{5}{63}$-($-\frac{6}{21}$)
= $\frac{5}{63}+\frac{2}{7}$
= L.C.M of 63 and 7 is 63. 
$\frac{5}{63}+\frac{2}{7}$= $\frac{5}{63}+\frac{18}{63}$ =$\frac{5+18}{63}$ = $\frac{23}{63}$