Show the before-and-after of one shape flipped over a line as pupils settle. Take three hands-up answers, not open call-outs. Listen for 'it turned around' or 'it's facing the other way' and hold those words for Watch and Notice.

Walk each example aloud, one at a time.

• Triangle — point to one corner, then to its match, and say 'two squares from the line here, two squares from the line there.'
• Rectangle — emphasise that the shape stays the same size; only the way it faces changes.
• Arrow — pause before revealing and ask 'which way will it point?'
• Shape away from the line — this is the new idea. Count aloud: 'two squares from the line here, two squares from the line there, four squares right across the line.' Pupils will meet this again as the trickiest challenge later, so build it carefully now.
• L-shape — stress that the line now goes side to side, so the flip is up-and-down. This is the case pupils most often slide instead of flip.

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

Set the mirror line, then shade a few squares of a simple shape on one side. As the tool reflects each square, ask the class to count squares from the line on both sides before agreeing. Rotate four pupils. Between shadings, keep the watching class live: pose a quick question to the room — 'before it reflects, how many squares from the line is this corner?' — take two hands-up answers and revoice the right one so the back rows hear a classmate reason it out. Watch for the slide error — if a pupil expects the shape to face the same way, replay the L-shape from Watch and Notice.

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 fourth challenge (a shape two squares away from the line) is the high-ceiling one. Its starting shape is already shaded two squares clear of the line on the board, so pupils can see the gap. Count it aloud as a class: 'two squares this side, two squares that side, four squares across the line.' Ask 'did it flip over, or just slide along?' at each one.

Keep this brief — recap the three bullets and link forward to turns. No activity-book hand-off needed in this step.