Once your learners can confidently identify corresponding, alternate and co-interior angles they are ready to begin calculating missing angles in parallel lines and this worksheet is the ideal place to start. Students are encouraged to state the reasons alongside each angle calculation throughout. We have produced two versions of this worksheet: with and without clues. This version, with clues, begins with the reasons students will use. Choose which is appropriate for your class or individuals.

Section A begins with 4 basic questions to remind your students of the difference between the angles on parallel lines.

Section B builds to include angles on straight lines, vertically opposite angles and two-step calculation problems.