(a)　How many groups of 1/5 are there in:[br]　　(i) 1; 　(ii) 2;　(iii) 5;　(iv) 2/3;　(v) 1⅔.[br](b)　How many groups of 1⅓ are there in:[br]　　(i) 1; 　(ii) 2;　(iii) 4; 　(iv) 3/5;　(v) 5+3/5.[br][br]In general, how would you calculate x ÷ a/b?

Anthony Or. GeoGebra Institute of Hong Kong. (中文版：http://www.geogebratube.org/student/m116499 )[br]orchiming@gmail.com