Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 The OC maths test has how many questions?
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35 questions in 40 minutes.
2 Estimate to one option: 6 × 298 is closest to… 180, 1800, or 18000?
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6 × 300 = 1800.
3 Should you ever leave an OC question blank?
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No — no penalty means a guess beats a blank.
Level 2 · Core
4 Options: 5, 6, 7, 8, 9 for "▲ × 6 = 42". Testing the MIDDLE option first, is it correct?
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Middle is 7: 7 × 6 = 42 → yes, first try!
5 A question asks "how many MORE stickers are needed to reach 30" and you have 12. The trap option is 30 — what is the correct answer?
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30 − 12 = 18. (30 is the target, not the answer.)
6 You eliminated 3 of 5 options and must guess. What fraction is your chance now?
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Two remain → 1/2.
Level 3 · Challenge
7 Which is the trap in: "What is the greatest number of 5c coins NOT exceeding $0.32?" — 6 or 7?
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7 × 5 = 35c EXCEEDS 32c → 7 is the trap; the answer is 6.
8 Pass 1 took 24 min for 28 questions. How many minutes per remaining question (7 left, 16 min)?
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16 ÷ 7 ≈ 2 min each — the skip strategy bought you double time.
9 A answer option says "14 m" but the question asks for centimetres and the objects are pencil-sized. Eliminate it?
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Yes — units + sense: pencils are not 14 metres!