Question
Evaluate: $-\frac{5}{7}-\left(-\frac{3}{8}\right)$
✓
Answer
$\begin{aligned} & -\frac{5}{7}-\left(-\frac{3}{8}\right) \\ & -\frac{5}{7}+\frac{3}{8}\end{aligned}$
| 2 | 7,8 |
| 2 | 7,4 |
| 2 | 7,2 |
| 7 | 7,1 |
| 1 |
L.C.M. of 7 and $8=2 \times 2 \times 2 \times 7=56$
$ \Rightarrow \frac{-5 \times 8}{7 \times 8}+\frac{3 \times 7}{8 \times 7} $
$(\because$ L.C.M. of 7 and $8=56)$
$ =\frac{-40+21}{56}=\frac{-19}{56} $
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