Objective: The student will use estimation, calculation of
percentages and subjective-reasoning skills. Teacher: One apple
per student; one scale or balance with weights per group;
napkins. Students: paper and pencil. Teacher Preparation: Wash
apples. 1. Have class discussion about percentage and what
students consider to be the edible part of fruit. 2. Divide
class into cooperative learning groups. 3. Hand out apples and
napkins. 4. Have students estimate what part or percentage of
apple is edible. 5. Instruct students to weigh apples (and
napkin) and record result on paper. 6. Students eat their
apples, saving all uneaten parts on their napkin. 7. Students
should then weigh the napkin holding the uneaten part of the
apple. 8. Students subtract weight of uneaten part from whole
weight to find weight of edible part. 9. Students divide edible
weight by whole weight to find percentage. 10. Have one person
from each group record the data from each person. 11. One person
from each group shares with the class the