Any activity that you do with food is going to keep the kids' interest. This is an activity that you can use with either Skittles or M&Ms. I use this activity at the end of the year as a review. You can use it as a math center, time filler, and review. This activity reviews estimating (estimating the number of skittles or m&ms), adding, subtracting, sorting (by color), and graphing (by 2 and pictograph). The activities are the same for Skittles and for M&Ms. It just depends on which one you have on hand or buy. I have included a color version and a black and white version.
You can purchase this activity at my TeachersPayTeachers site.