We have been looking at Area and Perimeter in class this week. This got us thinking about volume.
The children were given a 20 cm squared piece of paper and cut out 1 cm square corners. We folded up the sides and worked out that the 'trays' we had made would hold 324 one centimetre cubes (because the area was 18 cm x 18 cm).
Next we cut out 2 cm squared corners from the paper. The area in the tray was 16 cm x 16 cm so it held 256 one centimetre cubes. BUT then we realised that because the sides of our tray were higher so we could hold twice as many cubes (256 x 2 = 512). By continuing the investigation, we worked out the way to find the volume of our trays was to multiply the length and width of our base (to find the area) and then multiply this by the height (to find the volume in cm cubes - or cubic centimetres!).