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Arithmetic and Operations Flashcards

6 cards from real IMO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Arithmetic and Operations flashcards as text

  1. What is the result of 5/8 + 3/8?

    Answer: 1

    5/8 + 3/8 = 8/8 = 1.

  2. Which of the following is the greatest: 3/4, 5/8, 7/10, or 2/3?

    Answer: 3/4

    Converting to decimals: 3/4 = 0.75, 5/8 = 0.625, 7/10 = 0.70, 2/3 ≈ 0.667; so 3/4 is greatest.

  3. What is 2.5 × 4.2?

    Answer: 10.5

    2.5 × 4.2 = 10.5.

  4. A student scored 72 out of 90. What percentage did they score?

    Answer: 80%

    Percentage = (72/90) × 100 = 80%.

  5. What is the value of 7! (7 factorial)?

    Answer: 5040

    7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040.

  6. If a train covers 3/5 of a journey in 3 hours, how long will the full journey take?

    Answer: 5 hours

    If 3/5 takes 3 hours, the full journey = 3 ÷ (3/5) = 3 × 5/3 = 5 hours.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. imo-official.org — Test delivery, eligibility, passing score, test dates, exam format · verified Oct 2026
  2. imo2027.hu — Exam dates, registration deadline · verified Oct 2026