bear in mind that most entrants at GCSE would miss this question out, so don't give yourself too hard a time of it! I have tried using envelopes to share things into equla shares etc. Funny when i trained as a Maths teacher, it was educational theory that children under the age of approx 13 were generally unable to imagine most problems invilving algebra etc. ie brain development tests had shown that abstract thought was beyond most preadolescent brains. I suppose they could use their chunking method approach to division i would draw a cross for each boy, then a circle for each girl: xoo xoo xoo xoo xoo and keep going til they have the correct amount then add up the o and x worth a try but remember that the best way to get top grades is to do all the things you can perfectly and spend as little time as possible on the very difficult bits. then go back and have a go at the end. incidentally do you get them to add yp the points lost to silly mistakes, and give them their level AND crucially "marks needed to get the next level" very often they are 1 or 2 marks away and blew more than that on page one!