Students will learn that two people do not necessarily have the same way of looking at things. Allow students in small groups to feel the rocks and examine them closely. With only the one set of rocks provided, this activity works best at a center. However, if you made additional sets for every two or three children, this can be done as a cooperative activity. Let students have time to take a good look at each rock, list all the attributes, and find a corresponding value for each attribute.
Students share their sums.
This activity can be repeated with different rocks and a different set of values for the attributes.