Properties of Shape - Calculate Angles on a Straight Line - Planning

In a Year 5 mathematics lesson focused on the Properties of Shapes, students are introduced to calculating angles on a straight line. The lesson utilises resources such as angle cards, worksheets, and a presentation to facilitate learning. Key vocabulary terms such as 'angle', 'degrees', 'right angle', and 'subtract' are central to the lesson, with vocabulary cards and definitions available to support understanding. The lesson begins with a starter activity that recaps previous learning and sets the stage for discovering that the sum of angles on a straight line is 180 degrees. Students engage in partner work to explore the degree measure of right angles and their combinations. They then participate in a practical group activity, using angle cards to match pairs of angles that form straight lines.

Further activities involve modelling the process of finding missing angles. Students are shown how to apply subtraction to determine the missing angle when one angle is known, and they practice this skill on whiteboards. The lesson encourages discussion about efficient methods for subtraction and invites students to explore different ways to calculate missing angles. In a reasoning activity, students critically evaluate given angle information to identify errors. The plenary session includes reflection on the skills used and learned, such as addition and subtraction methods, and a 'Give me five' activity that helps students articulate their learning and challenges. Differentiated worksheets are provided to cater to varying levels of understanding, ranging from working towards expected levels to greater depth, with tasks involving finding missing angles with different degrees of precision.