1. Create a structure with sides of 20-30 cms. 2. Use a weigh scale to figure out how heavy it is. 3. What you could do to the structure to make it weigh less while still keeping the sides the same length as before? 4. Use to take a photo of the new lighter structure. 5. Use to write how much it weighed at first and how much it weighs now. 3. Use a tool of your choice to show and/or tell about how you made your structure lighter. 4. Remember to to save your work.