I have to prepare a 40 minutes maths lesson on any maths top

I have to prepare a 40 minutes maths lesson (on any maths topic) to a class of mixed ability students in the 12 to 14 age group. I am new at this kind of work. Could you advise on an easy type of lesson topic to teach and also advise on relevant resources/diagrams/ websites etc to use. Also any other relevant advice that would be of assistance .

Solution

You can teach them topics like fractions and decimals or perimeter/area .

For area and perimeter very interactive site could be : http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html

for fractions and decimals

http://home.avvanta.com/~math/FDMENU.HTM

http://www.topmarks.co.uk/maths-games/7-11-years/fractions-and-decimals