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Lintel · Grades 5–7 Keystones #166 15 June 2026 Skills week 4 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 15 June 2026 · mathsvault.uk/keystones

  1. 1. Number Product of primes

    Express 120 as a product of prime factors

    Answer: 2³ × 3 × 5
  2. 2. Algebra Linear simultaneous equations

    Solve: 2x + 2y = 18 and x + 3y = 15

    Answer: x = 6, y = 3
  3. 3. Geometry Pythagoras — short side

    Calculate the missing side: a = 19cm, c = 25cm

    Answer: 16.2cm
  4. 4. Ratio Combining two ratios

    a:b is 2:5 and b:c is 5:4. Find a:b:c.

    Answer: 2:5:4
  5. 5. Statistics Expected frequency

    A fair coin is flipped 54 times. How many heads would you expect?

    Answer: 27