Question
What should be added to $\frac{-5}{7}$ to get $\frac{-2}{3}?$
✓
Answer
The required number $=\frac{-2}{3}-\Big(\frac{-5}{7}\Big)$
$=\frac{-2}{3}+\frac{5}{7}=\frac{-14+15}{21}$
(LCM of 3, 7 = 21)
$=\frac{1}{21}$
$=\frac{-2}{3}+\frac{5}{7}=\frac{-14+15}{21}$
(LCM of 3, 7 = 21)
$=\frac{1}{21}$
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