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Cornerstone · Grades 3–5 Keystones #271 28 September 2026 (today) Skills week 5 of 7
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Five GCSE retrieval questions · 28 September 2026 · mathsvault.uk/keystones

  1. 1. Number Index law — multiplication

    Simplify: x8 × x2

    Answer: x10
  2. 2. Algebra Unknowns on both sides

    Solve: 8x - 4 = 2x + 38

    Answer: x = 7
  3. 3. Geometry Converting mixed metric units

    Convert 4795ml to litres

    Answer: 4.795 litres
  4. 4. Ratio Mixed ratio problems

    Simplify: 12:8:20

    Answer: 3:2:5
  5. 5. Statistics Expected frequency

    A fair coin is flipped 138 times. How many heads would you expect?

    Answer: 69

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