a)

Obliczamy, jakim procentem liczby $72$ jest liczba: $9$, $4$, $18$, $27$, $36$, $72$, $108$ oraz $144$.

$\frac{{\cancel{9}}^1}{{\cancel{72}}_8}\cdot 100\%=\frac{1}{{\cancel{8}}_2}\cdot {\cancel{100}}^{25}\%=\frac{25}{2}\%=12\frac{1}{2}\%$

$\frac{{\cancel{4}}^1}{{\cancel{72}}_{18}}\cdot 100\%=\frac{1}{{\cancel{18}}_9}\cdot {\cancel{100}}^{50}\%=\frac{50}{9}\%=5\frac{5}{9}\%$

$\frac{{\cancel{18}}^1}{{\cancel{72}}_4}\cdot 100\%=\frac{1}{{\cancel{4}}_1}\cdot {\cancel{100}}^{25}\%=25\%$

$\frac{{\cancel{27}}^3}{{\cancel{72}}_8}\cdot 100\%=\frac{3}{{\cancel{8}}_2}\cdot {\cancel{100}}^{25}\%=\frac{75}{2}\%=37\frac{1}{2}\%$

$\frac{{\cancel{36}}^1}{{\cancel{72}}_2}\cdot 100\%=\frac{1}{{\cancel{2}}_1}\cdot {\cancel{100}}^{50}\%=50\%$

$\frac{{\cancel{72}}^1}{{\cancel{72}}_1}\cdot 100\%=1\cdot 100\%=100\%$

$\frac{{\cancel{108}}^3}{{\cancel{72}}_2}\cdot 100\%=\frac{3}{{\cancel{2}}_1}\cdot {\cancel{100}}^{50}\%=150\%$

$\frac{{\cancel{144}}^2}{{\cancel{72}}_1}\cdot 100\%=2\cdot 100\%=200\%$

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b)

Obliczamy, jakim procentem $1$ metra ($1\text{m}=100\mathrm{cm}=1000\mathrm{mm}$) jest:

$\to 1\text{cm}:$  

$\frac{1}{1\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=1\%$

$\to 15\text{cm}:$  

$\frac{15}{1\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=15\%$

$\to 90\text{cm}:$  

$\frac{90}{1\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=90\%$

$\to 25\text{cm}:$  

$\frac{25}{1\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=25\%$

$\to 50\text{cm}:$  

$\frac{50}{1\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=50\%$

$\to 1\text{mm}:$  

$\frac{1}{10\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=0,1\%$

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c)

Obliczamy, jakim procentem $1$ kilometra ($1\mathrm{km}=1000\text{m}=100000\mathrm{cm}$) jest:

$\to 1\text{m}:$  

$\frac{1}{10\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=0,1\%$

$\to 350\text{m}:$  

$\frac{35\cancel{0}}{1\cancel{0}\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=35\%$

$\to 1000\text{m}:$  

$\frac{1\cancel{0}\cancel{0}\cancel{0}}{1\cancel{0}\cancel{0}\cancel{0}}\cdot 100\%=100\%$

$\to 840\text{m}:$  

$\frac{84\cancel{0}}{1\cancel{0}\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=84\%$

$\to 100\text{m}:$  

$\frac{10\cancel{0}}{1\cancel{0}\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=10\%$

$\to 1\text{cm}:$  

$\frac{1}{1000\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=\frac{1}{1000}\%=0,001\%$

$\to 50\text{cm}:$  

$\frac{5\cancel{0}}{100\cancel{0}\cancel{0}\cancel{0}}\cdot 1\cancel{0}\cancel{0}\%=\frac{5}{100}\%=0,05\%$