Take three hands-up answers on what makes the balanced poster feel balanced. Steer toward the shapes turn around a middle point and the empty space is spread evenly without naming rotational symmetry yet — that lands in a later step.

Point to the 6 cm by 5 cm title box shown on screen. Ask the class how many squares it covers (30), then ask what share of a 100-square page that is (30%). Draw out that on a 100-square page, the number of squares a shape covers IS its percentage.

Build the order-4 idea live on the board so pupils watch it happen, do not just tell them. Draw one corner shape, then draw the same shape rotated a quarter turn into the next corner, and so on until all four corners match. Ask how many times does it look the same in one full turn? before saying four.

Then sketch a short border strip: triangles fitting edge to edge with no gaps, and contrast it with a pentagon that leaves a gap so pupils see what tessellating means. Hold out for pupils to name the order-4 idea themselves.

Talk this one through together — pupils take turns at the board and the class agrees or corrects out loud.

Before each bar shows, ask the class to predict its height. Then move to the poster question: a chart drawn as a 5-square by 5-square box covers 5 × 5 = 25 of our 100 squares, so it takes a quarter of the page. Revoice any pupil who links the box size to how much room it needs on the page.

Drive this interactive on the IWB; pupils call out each move and explain their thinking. Keep the focus on the poster question: a chart drawn as a 6-square by 5-square box covers 6 × 5 = 30 of the 100 squares, so it takes almost a third of the page. That leaves 70 squares for the title box, corner shapes and border, which feeds straight into the layout decisions they make next.