This is a math investigation where students take a watermelon and use critical thinking skills to solve problems. It covers measurement, counting, grouping, data collection, comparing and ordering, and higher order thinking skills. There is a "group leader job" page of directions included that a volunteer could use to guide the group. This can be done whole group, but I have had better success with several small groups. It is a fun and interactive way to get students involved in math. Suggested grade levels are 1-3, but could be modified for others.