5:01Millimetres, centimetres and metres

Convert measurements mm to cm to m. Decide whether each item has been measured in mm, cm or m. Explain why millimetres, centimetres or metres would not be suitable units for measuring the distance from Sydney to Canberra, and state what else would not be measured in these units. State the length, width and perimeter of the photo. Estimate its area and the distance between opposite corners.