Display the spot-the-mistake image as pupils settle. Take three hands-up answers, not open call-outs. Listen for pupils noticing the middle dot is off the corner or the bottom edge is not along an arm.

Don't reveal the correct placement yet — that lands in Watch and Notice, where we'll give these the proper names vertex and baseline. Keep this to about a minute.

Walk each example aloud, one at a time. The single most important habit to model: centre on the vertex first, then baseline along an arm. Say it verbatim each time.

• 40° — point at the zero on the baseline arm, then trace that same ring up to 40. Show the other ring saying 140 so pupils see why choosing the ring matters. Which arm did we start counting from?
• 130° — head off the wrong-scale slip; estimate first (more than a right angle, so over 90) before reading.
• 90° — both rings meet at 90, so it never matters which you read here.
• 290° — show the small 70° angle and the big angle going round, point out that together they make one full turn of 360°, then do the subtraction 360 − 70 = 290.

The inner scale is on for this lesson because reading the right ring is the whole point.

This round is for talking it through together — pupils take turns at the board and the class agrees or corrects out loud.

Set three or four different angles in turn, all within 0–180°. Before each read, ask the class to estimate (bigger or smaller than a right angle?) so they catch a wrong-ring reading before it happens. Rotate four pupils to position the protractor and read aloud.

Watch for the centre drifting off the vertex — the commonest slip. Revoice a good fix: centre on the vertex, then swing the baseline onto the arm.

This round is the practice bank — 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 35° catches careless readers who grab 145° off the wrong ring — make them estimate first. The 290° reflex needs the whole-turn step: the small angle is 70°, and 360 − 70 = 290 because the two go all the way round; talk it through as a class. Use the Check ✓ as part of the narration: yes — that's it.

Quick recap of the centre-then-baseline habit. Hold up one protractor and re-state the placement order one last time before the activity-book practice.