Take three hands-up answers, not open call-outs. Listen for pupils who say 5 (2 + 3) rather than 2 or 3 — the count-the-parts idea is the whole hinge of the lesson.

Revoice a strong answer: so we add the parts of the ratio together first. Don't confirm the euro shares yet — that is the model step.

Point at the bars, don't drag them (static snapshots). Say the three moves aloud each time, count, divide, multiply, this is the script pupils reuse all lesson.

€30 in 2:3: 2 + 3 = 5 parts, €30 ÷ 5 = €6, Aoife 2 × €6 = €12, Niamh 3 × €6 = €18, check €12 + €18 = €30.

After example 1: ask what we did first before any dividing, take two hands-up, re-establish count the parts.

€40 in 3:5: 3 + 5 = 8 parts, €40 ÷ 8 = €5, gives €15 and €25. Pause before revealing, ask the class to predict whether the shares add back to €40, then confirm €15 + €25 = €40.

24 sweets in 1:2: 1 + 2 = 3 parts, 24 ÷ 3 = 8, shares 8 and 16. Draw out that the bigger share is twice the smaller, matching 1:2.

Before example 4: point to one pupil, ask them to say the three moves in order to re-engage the room.

€100 in 1:2:2: three-way share, 1 + 2 + 2 = 5 parts (stress ALL parts, 5 not 3), €100 ÷ 5 = €20, shares €20, €40, €40, check €20 + €40 + €40 = €100.

Hold here until they can recite count the parts, divide the total, multiply each share back to you.

This round is for talking it through together — pupils take turns at the board and the class agrees or corrects out loud. The bars start on €60 in 1:5; after each problem, reset the parts and total on the interactive yourself and hand the next turn to a new pupil, working through the four in the stated order.

Order the round so it builds: €60 in 1:5 (six parts, €10 each — clean); €72 in 3:5 (eight parts, €9 each — the divide is the wrinkle); €50 in 2:3 (five parts, €10 each — a friendly reset); then €120 in 1:2:3 (six parts, €20 each — the key one where the three-way share is the harder count).

Each time, make a pupil name the part-count aloud before they touch the total. The most common slip is dividing by one of the ratio numbers (3 or 5) instead of by the sum (8). Watch for it on €72 in 3:5 and revoice: we divide by all the parts added together.

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. Take a quick show of hands for the one-part prediction before each Check, and reassure that a wrong guess is fine.

The round escalates: €80 in 3:5 (eight parts, €10 each) is a fresh warm-up; €72 in 3:5 (eight parts, €9 each) makes the divide the tricky bit; €100 in 2:3 (five parts, €20 each) is a friendly reset; €120 in 1:2:3 (six parts, €20 each) is the key one — three shares, six parts. Watch for pupils dividing by a single ratio number instead of the sum.