Lesson 4 In this lesson, children learn that when two or more straight lines cross and share a vertex, it creates vertically opposite angles. Children use this knowledge, and their understanding of angles on a straight line and angles around a point to help them solve missing angles. There is a teaching presentation accompanied by differentiated activities with a range of fluency, reasoning and problem-solving questions. Year 6 Mathematics Content Descriptors V8.4 Investigate, with and without digital technologies, angles on a straight line, angles at a point and vertically opposite angles. Use results to find unknown angles ACMMG141 V9 identify the relationships between angles on a straight line, angles at a point and vertically opposite angles; use these to determine unknown angles, communicating reasoning AC9M6M04 Differentiation: There are three levels of differentiation in this pack: ‘working towards,’ ‘expected’ and ‘greater depth’. Level of this Pack: Age: 9-10 Australia: Grade 6...