Students work in pairs. Partners take turns testing objects for attraction to the magnet. Students plan for arranging the two groups, those attracted and those not attracted, so that they can compare the two groups. Encourage students to make observations about the two groups. Listen for references to relative numbers of objects.
Students continue to add to the collection.
Encourage them to predict which group an object will belong to based on observations of the characteristics of the objects in each group. Partners take turns using the balance scale to compare the masses of two objects. Partners work together to order three objects according to their masses. The teacher listens for language such as greater than, less than, equal to, in between, etc. Students order a set of six or more objects according to their masses.