Some of the difficulties that my year 9 have had with angles during this unit of work

In the Angle reasoning topic I think the focus needs to be on the reasoning and not so much the calculation. You can spend some time asking them to find the 3rd angle of a triangle, but understanding why an angle is 40° show a deeper understanding. I like to get students to draw triangles on dotty paper and then categorize them as isosceles, equilateral etc. This reinforces their understanding of each triangle.

Then i like to give students this task or similar:

Here’s a task I created because many of my students made assumptions about lines being parallel and just looked for alternate and corresponding angles in any lines regardless of marked parallel lines. Students can discuss when they might be or never can be and why.