Angles on Parallel Lines | I Do, We Do, You Do | Year 8 Maths | Print Free

Teach angles on parallel lines with this editable, 60-slide Year 8 maths PowerPoint. Pupils identify corresponding, alternate interior and co-interior angles, calculate missing angles and explain the facts that justify their answers.

Designed for print-free teaching: pupils write angle sizes, calculations and explanations in exercise books or on mini-whiteboards. Shared diagrams remove the need for printed worksheets or copied figures.

WHAT IS INCLUDED?
• One editable PowerPoint containing 60 slides.
• Six retrieval questions with grouped answers.
• Six prerequisite questions with grouped answers.
• Illustrated vocabulary and three separate diagrams showing the main parallel-line relationships.
• Worked teaching examples combining angle facts and forming an equation.
• Six matched I Do/We Do examples with worked answers.
• Twenty AFL questions, each immediately followed by its answer slide.
• Twenty-four angle practice questions with answers and reasons.
• Eight Developing, eight Secure and five Greater Depth questions, plus a two-part Super Challenge, on one page.
• Answers for all differentiated tasks and the challenge.

MODELLING AND GUIDED PRACTICE
The six examples form three matched pairs: (1) with (4), (2) with (5), and (3) with (6). Rotated diagrams help pupils recognise the relationships in different orientations. Further examples connect corresponding angles with angles on a straight line and use co-interior angles to form and solve an equation.

PRACTICE AND PROGRESSION
The main practice page uses one large figure with eight labelled angles. Each of the 24 questions gives a named angle and asks pupils to find another, for example, “a = 42°. Find e.” Questions vary the given angle and the requested angle, covering corresponding, alternate interior, co-interior and vertically opposite relationships before combining facts. Answers include the angle size and a reason.

Developing provides fresh values using the same clear question style. Secure introduces ratios, algebraic expressions, related unknowns and changes in angle size. Greater Depth asks pupils to test whether lines can be parallel, challenge incorrect claims, explain the equal co-interior case and justify why rotation preserves angle relationships.

SUPER CHALLENGE
Three of the eight angles total 240°. Pupils find every possible acute angle and explain why their list is complete. They then consider a total of 300° and decide whether the possible acute angles change. The solution considers all four combinations of acute and obtuse angles and uses supplementary angles to connect the cases.

CLASSROOM PRESENTATION
Editable diagrams use clear labels, angle arcs and matching arrows for parallel lines. Diagram pages state that figures are not drawn to scale. Compact headings preserve space for questions, and a divider clearly separates the Super Challenge from the other tasks.

Suitable for Year 8, KS3 consolidation, tutoring and revision. Topic reference: M606.