a)

$\frac{{\cancel{12}}^1}{{\cancel{60}}^5}\cdot 100\%=\frac{1}{{\cancel{5}}^1}\cdot {\cancel{100\%}}^{20\%}=20\%$

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b)            

$\frac{{\cancel{11}}^1}{{\cancel{220}}^{20}}\cdot 100\%=\frac{1}{{\cancel{20}}^1}\cdot {\cancel{100\%}}^{5\%}=5\%$

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c)

$\frac{{\cancel{225}}^{15}}{{\cancel{15}}^1}\cdot 100\%=15\cdot 100\%=1500\%$

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d)

$\frac{{\cancel{21}}^7}{{\cancel{1,5}}^{0,5}}\cdot 100\%=\frac{7}{0,5}\cdot 100\%=\frac{7}{\frac{1}{2}}\cdot 100\%=7:\frac{1}{2}\cdot 100\%=7\cdot 2\cdot 100\%=1400\%$

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e)

$\frac{1,44}{3}\cdot 100\%=\frac{144}{3}\%=48\%$

Pomocnicze dzielenie pisemne:

$\begin{array}{l}\underline{48}\\ 144:3\\ \underline{-12}\\ 24\\ \underline{-24}\\ =\end{array}$

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f)

$\frac{1\frac{1}{3}}{2\frac{2}{3}}\cdot 100\%=\frac{\frac{4}{3}}{\frac{8}{3}}\cdot 100\%=\frac{4}{3}:\frac{8}{3}\cdot 100{\%}^{}=\frac{{\cancel{4}}^1}{{\cancel{3}}^1}\cdot \frac{{\cancel{3}}^1}{{\cancel{8}}^2}\cdot 100\%=\frac{1}{2}\cdot 100\%=\frac{{\cancel{100}}^{50}}{{\cancel{2}}^1}\%=50\%$