Students are to be provided a bag of skittles. They are going to use proportions and ratios to determine if there are the same number/ratio of each color in all different sized bags.
I had students work in groups of 2 for this activity. Within the activity I broke it up into three different sections; a pre-lab, lab, and post-lab portion. Students make initial guesses/hypothesis, test out their theory, use proportions and ratios to analyze their results and graph data.