a)

$1-\frac{1}{4}=\frac{\square }{4}-\frac{1}{4}=\dots$  

$1-\frac{1}{4}=\frac{4}{4}-\frac{1}{4}=\frac{3}{4}$  

W okienko wpisujemy $4$.

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$1-\frac{7}{10}=\frac{\square }{10}-\frac{7}{10}=\dots$

$1-\frac{7}{10}=\frac{10}{10}-\frac{7}{10}=\frac{3}{10}$  

W okienko należy wpisać $10$.

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b)

$1-\frac{6}{20}=\frac{\square }{20}-\frac{6}{20}=\dots$

$1-\frac{6}{20}=\frac{20}{20}-\frac{6}{20}=\frac{14}{20}$  

W okienko wpisujemy $20$.

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$1-\frac{25}{100}=\frac{\square }{100}-\frac{25}{100}=\dots$

$1-\frac{25}{100}=\frac{100}{100}-\frac{25}{100}=\frac{75}{100}$   

W okienko wpisujemy $100$.

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c)

$2-\frac{5}{6}=1\frac{\square }{6}-\frac{5}{6}=1\frac{\square }{6}$  

$2-\frac{5}{6}=1\frac{6}{6}-\frac{5}{6}=1\frac{1}{6}$  

W okienka należy odpowiednio wpisać $6$ oraz $1$.

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$3-\frac{1}{3}=2\frac{\square }{3}-\frac{1}{3}=\dots$

$3-\frac{1}{3}=2\frac{3}{3}-\frac{1}{3}=2\frac{2}{3}$   

W okienko należy wpisać $3$.

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d)

$4-\frac{6}{10}=3\frac{\square }{\square }-\frac{6}{10}=\dots$    

$4-\frac{6}{10}=3\frac{10}{10}-\frac{6}{10}=3\frac{4}{10}$   

W okienka trzeba wpisać $10$ i $10$.

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$5-\frac{1}{7}=4\frac{\square }{\square }-\frac{1}{7}=\dots$     

$5-\frac{1}{7}=4\frac{7}{7}-\frac{1}{7}=4\frac{6}{7}$  

W okienka wpisujemy $7$ i $7$.