I use this lesson with my Yr 8 class at Christmas time and they love it! It begins with a game with each student having a cup and 10 m&ms. It is rich in mathematical concepts, but you can bypass these and just focus on the repeated trials and using tree diagrams. The task can be used in higher levels to teach binomial probability and distribution, replacement vs non-replacement, multiplication rule etc. I use packets of red and green m&ms which are available at this time of the year, bu