Assess students' ability to predict and test whether common classroom objects sink or float. Using a small selection of items (e.g., plastic toy, wooden block, metal spoon, crayon), learners make predictions, carry out simple water tests, record outcomes with age‑appropriate methods (drawings, checklists), compare predictions to results, and explain observations using basic ideas of weight, material, shape, and buoyancy; includes prompts for classroom discussion and formative assessment strategies for Pre-K–2.