oblicz jakim procentem: a)  liczby 72 jest liczba 9 , 4 , 18, 27, 36, 72, 108, 144. b) 1 metra jest : 1cm , 15cm, 90cm  ,25cm , 50 cm, 1mm. c) 1 kilometra jest : 1m , 350 m , 1000m , 840 m , 100m , 1cm, 50 cm . 

a) 9/72 = 12.5%      b)1(cm)/100(cm) = 1%      c)1(m)/1000(m)= 0.1%   4/72 = 5.56%          15/100 = 15%                    350/1000 = 35%  18/72 = 25%             90/100 = 90 %                  1000/1000 = 100%   27/72 = 37.5%         25/100 = 25%                     840/1000 = 84%   36/72 = 50%            50/100 = 50%                     100/1000 = 10%   72/72 = 100%          1(mm)/100 = 0.1 %             1(cm)/100000(cm) = 0.001%  108/72 = 150%                                                   50/100000 = 0.05%  144/72 = 200%