8 div 2 1/2?
\( \quad8\div2\frac12\\ =\\ \quad8\div(2+\frac12)\\ =\\ \quad8\div(\frac42+\frac12)\\ =\\ \quad8\div(\frac52)\\ =\\ \quad8\times(\frac25)\\ =\\ \quad\frac{8\times2}{5}\\ =\\ \quad\frac{16}{5}\)
