Wiemy, że  $256\cdot 12=3072$  

• 256% liczby 12 to 30,72   

$256\%\text{liczby}12\text{to:}256\%\cdot 12=\frac{256}{100}\cdot 12=\frac{256\cdot 12}{100}=\frac{3072}{100}=30,72$   

• 12% liczby 256 to 30,72 

$12\%\cdot 256=\frac{12}{100}=256=\frac{12\cdot 256}{100}=\frac{3072}{100}=30,72$  

• 2,56% liczby 12 to 0,3072 

$2,56\%\cdot 12=\frac{2,56}{100}\cdot 12=\frac{256}{10000}\cdot 12=\frac{256\cdot 12}{10000}=\frac{3072}{10000}=0,3072$  

•  25,6% liczby 12 to 3,072

$25,6\%\cdot 12=\frac{25,6}{100}\cdot 12=\frac{256}{1000}\cdot 12=\frac{256\cdot 12}{1000}=\frac{3072}{1000}=3,072$  

• 1,2% liczby 256 to 3,072

$1,2\%\cdot 256=\frac{1,2}{100}\cdot 256=\frac{12}{1000}\cdot 256=\frac{12\cdot 256}{1000}=\frac{3072}{1000}=3,072$   

• 120% liczby 256 to 307,2

$120\%\cdot 256=\frac{120}{100}\cdot 256=\frac{12}{10}\cdot 256=\frac{12\cdot 256}{10}=\frac{3072}{10}=307,2$   

• 12% liczby 2,56 to 0,3072

$12\%\cdot 2,56=\frac{12}{100}\cdot 2,56=\frac{12}{100}\cdot \frac{256}{100}=\frac{12\cdot 256}{10000}=\frac{3072}{10000}=0,3072$   

• 2,56% liczby 1,2 to 0,03072

$2,56\%\cdot 1,2=\frac{2,56}{100}\cdot \frac{12}{10}=\frac{256}{10000}\cdot \frac{12}{10}=\frac{256\cdot 12}{100000}=\frac{3072}{100000}=0,03072$