You may group them in any size, but working in pairs is optimal for this exercise.
Tell students: "We measure our rate of speed in a car in miles per hour.
This method of measuring a rate won't work for radioactive decay.
It may be combined with the Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, which can be done while students are flipping their candies.
In your planning, be sure to include time at the end of the lesson for students to post their data and share the class data.
Before the lesson, you will have to weigh out about 80 candies for each group of students.