this is a fun task (mini-project) for students once they have been taught volume and surface area.
you will need to ask students to bring in cardboard boxes from home. Give them suggestions like, toothpaste box, cereal box, grits box, etc. I usually tell them nothing bigger than a cereal box. It must be thin cardboard that they can easily cut apart to make a net.
in this task, students can work alone or in pairs. I would not do more than 2 students per box.
This is a hands on task that usually takes 2 days, but it is so worth it! I allow students to use calculators to speed up the task, but I require them to write down the formulas and show substitution.
There is also a extension page for students that may need a challenge or finish early.