





The Atlas Engine
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Two half-full tanks look reassuring until Mina reads their capacities. A short calculation keeps the service boat at the dock for one essential refill.






A fraction depends on its whole. Half of 12 litres is 6 litres; half of 24 litres is 12 litres. The same fraction can describe different amounts. The flying service boat and its cooling system are invented. The arithmetic is real.
Starting points: Halving even whole numbers, addition and subtraction to 24, recognising litres as a volume unit.
Half of 10 L is 5 L. Half of 16 L is 8 L. Together they hold 5 + 8 = 13 L.
Ages 9-11. Independent educator review and supervised reader testing have not yet been completed. The optional question needs only thought or paper and pencil.
Page 1
Panel 1: Kit gestures proudly towards two brass tanks on the boat. Ada and Mina listen.
Kit: Both tanks are half full. We're ready!
Panel 2: Captain Sora checks the departure list beside the three children.
Sora: We need twenty litres. Reserve included.
Panel 3: Ada points towards the smaller tank. Kit thinks about her answer.
Ada: Two halves make a whole. Enough, surely?
Panel 4: Mina leans towards the tanks, which have different widths.
Mina: A whole what? These tanks differ.
Page 2
Panel 1: Kit points at the tanks' water-level windows. Sora watches.
Kit: But both are halfway full!
Panel 2: Mina points towards the smaller tank while Ada studies the larger one.
Mina: Half of which tank? Read the capacities.
Panel 3: Ada compares the tanks as Kit holds her notebook.
Ada: 12 litres here. 24 litres there.
Panel 4: Kit pauses to think. Mina smiles beside him.
Kit: Same fraction. Different wholes.
Page 3
Panel 1: Ada holds her notebook beside a clear tank diagram.
Ada: Six litres here. Twelve there.
Diagram: two rectangular tanks of capacities 12 L and 24 L are half full. They hold 6 L and 12 L. The total is 18 L, which is 2 L below the stated 20 L requirement.
Panel 2: Mina works with her pencil while Kit listens.
Mina: Six plus twelve. Eighteen litres.
Panel 3: Kit holds up two fingers. Ada checks her notebook.
Kit: Two litres short. Twenty minus eighteen.
Panel 4: Sora stands beside the securely tied mooring rope. The children stay aboard.
Sora: We stay moored until we have enough.
Page 4
Panel 1: Kit reaches towards a bucket on the dock. His friends and Sora watch.
Kit: I'll fetch the water. We nearly left short.
Panel 2: Mina offers Kit a clear measuring jug beside the tap.
Mina: Use the jug. A bucketful isn't a number.
Panel 3: Kit fills the jug under Sora's supervision while Ada records the amount.
Ada: Eighteen litres, then two more.
Panel 4: Kit hands the jug to Sora, who pours water into the reservoir.
Kit: Twenty litres. This time, checked.
Page 5
Panel 1: Sora checks her clipboard beside the closed tank. The children listen.
Sora: Checks cost time. Running short costs more.
Panel 2: Ada writes in her notebook while Kit looks over.
Ada: I'll record every unit.
Panel 3: Kit smiles ruefully beside Mina.
Kit: Half of what? I'll ask first.
Panel 4: Mina smiles at Ada and Kit. They listen to her.
Mina: You heard me this time.
Page 6
Panel 1: Ada and Kit turn towards Mina as Sora prepares the boat.
Ada: We'll leave you room. We need your ideas.
Panel 2: Sora steers towards a floating relay station marked by a golden gull.
Sora: Gull Relay first. We need a fresh report.
Panel 3: Kit points at a paper message glider beside the station.
Kit: It's falling!
Panel 4: On the secure landing, Mina holds the fallen paper message. Sora and the other children gather around.
Mina: Let's check before we fix it.
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