Properties of Shape - Triangles - Starter

The lesson material provided presents a series of mathematical challenges aimed at Year 5 students during the Summer Term of Week 6, Day 5. It begins with a 'Fluent in Four' revision section, which encourages quick mental arithmetic, requiring students to complete addition and subtraction problems within a four-step framework. The problems involve finding complementing numbers to make totals of 61 and 97. Additionally, there is a focus on time, with students being asked to determine the time as '16 past 1 p.m.' based on a given clock face reading 13:16.

Following the arithmetic exercises, students are tasked with geometric problems, specifically involving triangles and rectilinear shapes. They must calculate missing angles in a triangle, given three angle measurements—60º, 65º, and 50º—and then find the perimeter of an illustrated rectilinear shape with sides measuring 30mm, 50mm, 30mm, 20mm, 80mm, and 50mm. The answer for the perimeter is provided as 260mm. Lastly, the students are required to complete a sentence stem related to a diagram, indicating the number of parts per hundred shaded and expressing this as a percentage. The given answer for this part is 56, which corresponds to 56%. It is noted that the diagrams and shapes are not drawn to scale, indicating that measurements are for calculation purposes rather than visual accuracy.