Perimeter - PowerPoint

In this Year 3 Maths resource, students are introduced to the concept of perimeter as part of their measurement studies. The lesson's objective is to teach children how to measure the perimeter of simple two-dimensional shapes. Perimeter is defined as the total length around the outside of a 2-D shape. To find the perimeter, students are instructed to measure the length of each side of the shape and then add these lengths together. The sum of these measurements gives the perimeter of the shape. A practical tip is provided: to mark a starting point with an 'X', measure each side as they go around the shape, and then return to the 'X' to ensure all sides are accounted for.

The resource goes on to apply this method to various shapes, including regular polygons, rectangles, and irregular polygons. For regular polygons, where all sides are equal, students can calculate the perimeter by multiplying the length of one side by the total number of sides. For rectangles, the opposite sides are equal, which simplifies the calculation. The lesson also tackles the perimeter of irregular polygons by adding the length of each unique side. To assist with learning, the resource includes a link to a song about perimeter, and it provides examples with the answers revealed to help students understand and practice the method of finding perimeters on a centimetre square grid.