Each table of fourth graders got a stack of books from a "hundreds." They had to work together to figure out how the subjects could be classified under one major label. If you are not a fourth grader and think you have cracked the code, put your answers in the comments!
Here are Grade 4 students working to identify their 100s' categories:
The next week, using what they knew about the categories, each group had to assign a stack of topic cards to the correct "hundreds." The students in both classes did a great job; even if they had something in the wrong place (like dinosaurs in the 900s), they were able to explain their reasoning (dinosaurs lived a long time ago, in ancient history). I love that they were using their brains!