Zadanie 1
75\%*100=\frac{75}{100}*100=75
50\%*8,5=\frac{50}{100}*8,5=\frac{1}{2}*\frac{85}{100}=\frac{85}{200}=\frac{17}{40}=0,425
10\%*420,5=\frac{10}{100}*420,5=0,1*420,5=42,05
Zadanie 2
a)
1\%*500km=\frac{1}{100}*500=5km
75\%*1000km=\frac{75}{100}*1000=75*10=750km
b)
5\%*1000zl=\frac{5}{100}*1000=5*10=50zl
25\%*700zl=\frac{25}{100}*700=25*7=175zl
c)
10\%*200,8kg=\frac{10}{100}*200,8=0,1*200,8=20,08kg
25\%*20,20kg=\frac{25}{100}*\frac{202}{10}=\frac{1}{4}*\frac{101}{5}=\frac{101}{20}=5,05kg
na kalkulatorze:
=0,25*20,20=5,05kg