(a)　How many groups are there if 1 is divided into groups of:[br]　　(i) 1/2; 　(ii) 1/3;　(iii) 1/4;　(iv) 1/5?[br](b)　How many groups are there if 1 is divided into groups of:[br]　　(i) 2/5; 　(ii) 3/5;　(iii) 4/5;　(iv) 1/5?[br](c)　How many groups are there if 1 is divided into groups of:[br]　　(i) 1+1/3; 　(ii)1+2/5;　(iii) 1+3/4?[br][br]In general, how would you calculate 1 ÷ a/b?

Anthony Or. GeoGebra Institute of Hong Kong. (中文版：http://www.geogebratube.org/student/m14537)[br]orchiming@gmail.com