(a) How many groups are there if 1 is divided into groups of: (i) 1/2; (ii) 1/3; (iii) 1/4; (iv) 1/5? (b) How many groups are there if 1 is divided into groups of: (i) 2/5; (ii) 3/5; (iii) 4/5; (iv) 1/5? (c) How many groups are there if 1 is divided into groups of: (i) 1+1/3; (ii)1+2/5; (iii) 1+3/4? In general, how would you calculate 1 ÷ a/b?
Anthony Or. Education Bureau, Hong Kong. (中文版：http://www.geogebratube.org/student/m14537) orchiming@gmail.com