These teaching slides complement Stage 3 Year A of the NSW Mathematics Sample Units of Work, Unit 3, released in 2026. In this unit, students are introduced to the kilometre to measure long distances. They estimate and measure lengths and distances using measuring devices and record lengths using the abbreviation for kilometres (km). Students calculate perimeters of two-dimensional shapes and compare the dimensions of rectangles with the same perimeter. They read, record, convert and use 24-ho