Provide a metaview, lifting students into a wider view of the concept. Use another medium (not reading or writing) to connect students' personal knowing to the concept (i.e. visual arts, music, movement, metaphor, etc.) Involve learners in reflective production that blends the emotional and the cognitive.

Groups create and try new estimation procedures.

Objective: To learn other ways to determine the number of particles in a sample without counting them.

Activity: Continuing to work with the same group, students are asked to determine the number of particles in a different sample without counting. They must devise an actual procedure to carry out and test their idea, with proper equipment (such as balance and/or ruler) provided by the teacher. Each group experiment is guided by the following questions: 1. What do you assume about each particle? (Must you assume that each particle is equal?) 2. Is that a valid assumption? 3. Would it help to know how much 1 dozen particles of the sample weighs? How? Each group shares its results with the class.

Assessment: Ability of students to try to solve the problem.