Measurement - Hefting Success Criteria: I can make a good guess. I can explain why I think something might be heavier or lighter. I can heft objects to determine the heaviest and lightest. Watch multimedia instructions. Step 1. Go to 2 and make a prediction by using the to circle the object you think is heavier. Step 2. Find your first two objects. Step 3. Press then to record yourself hefting the objects. Step 4. Repeat the prediction and hefting for the objects on 3, 4, and 5. Step 5. Press to upload your work.