All you need to answer these questions:
parallel
perpendicular
Year 3:
Lesson 6- parallel or perpendicular lines
Parallel or perpendicular lines
Reasoning
Problem solving
Flag inspiration!
Mental maths
https://www.topmarks.co.uk/maths-games/hit-the-button
https://www.splashlearn.com/math-skills/fourth-grade/geometry/parallel-and-perpendicular-lines