Take two or three hands-up answers, don't settle it yet — we'll see who's right in a moment. Keep this to a single question; the drawing itself happens in the next step.

Name the three moves as you point at the first one: mark the dot, rule the baseline, count round to the target and mark it. Then rule the second ray through that mark.

• 60° — confirm the class prediction: the dot comes first, then the baseline, then the count.
• 95° — just past the square corner; hold out for pupils spotting it is obtuse, not acute.
• 175° — the make-or-break one; the ray is so flat that a one-degree slip is easy to see. Ask what would happen if the dot moved after the baseline was drawn.

Talk this one through together — a volunteer takes each turn at the board while the class predicts aloud and agrees or corrects.

For each target, ask the class where the ray will land before the pupil at the board sets it. The 90° one is the checkpoint: this is the square corner — both halves of the scale read the same here. Keep it brisk; three angles, three volunteers.

This is the practice round — pupils take turns at the board, check each answer, and the class confirms before moving on. Keep the board work brisk rather than over-explaining.

• The practice set runs acute (40°), obtuse (125°), right angle (90°), then obtuse (160°).
• The 90° one is the fluency check: it should be quick.
• Watch for pupils counting from the wrong zero on 125° and 160°.