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$\dfrac{a}{b}=a\t \dfrac{1}{b}$

Theory

ab=a1b\dfrac{a}{b}=a\cdot \dfrac{1}{b}

The numerator in a fractions can be moved out of the fraction by factoring out 1.1. 53=513=513 \dfrac{5}{3}=\dfrac{5\cdot 1}{3}=5\cdot \dfrac{1}{3}