Display the tag as pupils settle. Take three hands-up answers only, not open call-outs. Listen for whoever says €35 straight away and whoever gets stuck on the saving versus the final price — both are useful contributions to revoice later.

Method to establish and keep visible: find 10% by dividing by ten, halve it for 5%, add lots of it for bigger percentages; name the 1% move once (divide 10% by ten) — they need it for the VAT problem later.

€50 coat, 30% off: 10% = €5, halve for 5% = €2.50, 30% = 3 × €5 = €15 saving, €35 left. Stress €15 + €35 = €50 — the whole bar is always the original.

€80 game, 25% off: hold the prediction (bigger or smaller than €15?) until pupils commit. Then 10% = €8, 5% = €4, so 25% = €8 + €8 + €4 = €20 off, €60 left. Dearer item loses more money for the same percentage.

€200 bill, 10% added on: the switch from taking-off to adding-on. Hold the length prediction (longer or shorter?). Then 10% = €20 added on top, bill becomes €220; extra €20 drawn past the original €200 mark — longer bar than we started with.

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

Run each item as: find 10% first, build up or halve to the percentage needed, then decide add or take-off. On the €60 jacket, 10% is €6 so 20% is €12 off, paying €48. On the €30 top, the €7.50 saving is worked on screen — watch for pupils dropping the cent. On the €120 bill, 10% is €12 added, giving €132 — the only increase in the round, so flag the direction change. On the €80 boots, 10% is €8 and 5% is €4, so 15% is €12 off, paying €68. Keep the board work brisk. Do not have pupils write here — the copybook beat comes next.

These are the practice questions — 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.

• €35 game, 30% off — 10% is €3.50, so 30% is €10.50 off, paying €24.50.
• €150 coat, 40% off — 10% is €15, so 40% is €60 off; ask for the saving, not the final price.
• €120 + 23% VAT — the build-up (10% = €12, 20% = €24, 1% = €1.20, 3% = €3.60, VAT = €27.60, total €147.60) is now shown on screen; work it in those lit steps. The hardest arithmetic of the lesson.
• Better-deal question — 30% off €90 gives €63; €70 with 10% added gives €77. The cheaper final price is the better deal for a buyer, so 30% off €90 wins. Head off the trap of comparing the percentages instead of the final prices.

This is a open-ended round — every pupil can find 10%, and the strongest stretch to the two-offer comparison. If time is short, set the two-offer comparison as the item to return to.