Evaluate:
521−−1342\dfrac{5}{21} - \dfrac{-13}{42}215−42−13
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LCM of 21 and 42 is 2 x 3 x 7 = 42
5×221×2−−13×142×1=1042−−1342=10−(−13)42=10+1342=2342\dfrac{5 \times 2}{21 \times 2} - \dfrac{-13 \times 1}{42 \times 1}\\[1em] = \dfrac{10}{42} - \dfrac{-13}{42}\\[1em] = \dfrac{10 - (-13)}{42}\\[1em] = \dfrac{10 + 13}{42}\\[1em] = \dfrac{23}{42}21×25×2−42×1−13×1=4210−42−13=4210−(−13)=4210+13=4223
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