Measurement Length and Perimeter - Perimeter on a Grid - Presentation

In this lesson, students will be exploring the concept of perimeter within the context of rectilinear shapes placed on a grid. The objective is to calculate the perimeter of various shapes by understanding how to measure the boundary length of each figure. The lesson begins with a discussion on what constitutes a rectilinear shape, encouraging students to identify and describe these shapes. Following this, students are presented with a series of activities where they are tasked with calculating the perimeters of given shapes. These shapes are represented on a grid with 1cm by 1cm squares, although it's noted that the grid is not to scale for the purpose of the exercises.

The activities are designed to deepen understanding and challenge students' reasoning skills. For instance, students are asked if they can create a new shape with half or double the perimeter of a given shape 'x'. They are also prompted to think about how to draw a shape with the same perimeter as another, or with a perimeter that is 6cm longer. These tasks not only reinforce the method of calculating perimeter but also encourage creativity in manipulating shapes. To further stretch their abilities, students are invited to consider real-life applications of perimeter, such as designing a patio with a specific boundary length using a set number of paving stones. The lesson concludes with independent work and a discussion that prompts students to reflect on the concept of perimeter, the strategies for calculating it, and its practical uses in everyday life.