Question

5upon63minus(minus6upon21) find in without lcm
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Answer 1

Answer: $\dfrac{23}{63}$

Step-by-step explanation:

$\frac{5}{63} -(-\frac{6}{21})\\ =\frac{5}{63} + \frac{6}{21} \\ = \frac{5}{63} + \frac{2}{7} \\ = \frac{1}{7}(\frac{5}{9} + 2) \\ = \frac{1}{7} ( \frac{5 \cdot 1 + 2 \cdot9}{9 \cdot 1}) \\ = \frac{1}{7}( \frac{5 + 18}{9} ) \\ = \frac{1}{7} ( \frac{23}{9} ) \\ = \frac{23}{63}$