ReasonNumber patterns
Which number is missing: 27, 29, ?, 33, 35, 37?
- 31
- 33
- 29
- 30
Choose an answer.
Need a hint?
Check the equal step between two neighbouring numbers.
Answer & method
The trail adds 2 each time, so the missing number is 31.
SPACE ACADEMY · TRY, THINK, PLAY
Class 1 foundations, paper-style reasoning and higher-order challenges, with original diagrams and picture choices.
Just a quick try. Not saved; no game rewards.
ReasonNumber patterns
Choose an answer.
Check the equal step between two neighbouring numbers.
The trail adds 2 each time, so the missing number is 31.
Choose Explore, Reason or Stretch inside each chapter.
Translate representations, use place value and solve constrained number clues.
Try this chapterInterpret models, find unknown amounts and link operations instead of only calculating a total.
Try this chapterUse repeating groups, internal gaps and picture rules; older grades also separate linked number rules.
Try this chapterRead original figures, distinguish their properties and use the conditions shown in a diagram.
Try this chapterRead scales and rulers, compare like units and infer unknown measurements.
Try this chapterConnect clock hands, calendars and elapsed-time clues at the selected challenge level.
Try this chapterUse pictured values and price boards to compare purchases, change and budgets.
Try this chapterUse visual rules, codes, order or routes, with every stated condition applied.
Try this chapterDrive around obstacles, collect repair crates and reach the exit.
Play missions, fit your craft and explore 3 expedition stops.
Chapter and mixed missions have 8 untimed questions. The game saves each answer. A finished mission earns one launch charge. Different questions in completed chapter, mixed or paper sets contribute to linked craft systems; repeating one chapter cannot unlock every system.
The original practice paper has 35 questions. It is deliberately untimed, not an official paper or a reproduction of official timing or scoring, and does not claim complete exam coverage.
Repair your rover, collect supplies on a grid and travel in its orbital carrier. Each chapter goal is 8 different questions in finished sets. Start with three core systems; later expeditions need more. Complete the playable activity as well as fitting the required systems.
This campaign explores mars and beyond. One Universe Passport is shared across grades. Earlier discoveries and earned parts stay; revisiting a known object does not cost another charge. Parts are not taken away for mistakes or consumed by flights. There are no daily streak requirements, purchases or advertising rewards. Travel and sizes are make-believe, with safe observation rather than landing on stars or gas giants.
Learning reports distinguish hinted answers from independent first choices. They consider up to 20 recent different, unhinted questions per skill and level, and wait for at least five before suggesting extra practice. Repeating the same question does not add evidence. Reports are practice evidence, not IQ scores, diagnoses, ranks or predictions of competition results.
Ask the learner to explain a drawing or check with objects too. Choose Explore or an earlier chapter when a step feels too large.
The grade topics use SOF IMO Class 1 published topic syllabus as their primary reference. The SOF sample and CREST previous-year paper below informed representations and reasoning demands. Providers have different topic boundaries; their syllabi are not interchangeable.
Questions, diagrams, picture choices, hints and explanations are original Otterly work, not copied paper questions or publisher artwork. No Olympiad provider is affiliated with or endorses Space Academy. This is not complete exam preparation; follow classroom teaching and check the current official syllabus too. Independent educator review is still needed for difficulty and breadth.
Read the content and coverage notes before using this as exam preparation.
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These page examples never change a saved game. Game links carry question settings, not a learner’s answers. There are no names, school details, public profiles, chat, analytics or advertising SDKs in the game. Grown-up guidance · Privacy
Original Otterly practice, not an official exam. Game progress stays on this browser.