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Lintel · Grades 5–7 Keystones #223 11 August 2026 Skills week 5 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 11 August 2026 · mathsvault.uk/keystones

  1. 1. Number Error intervals

    A value is 79.4 (to dp). State the error interval

    Answer: 79.35 ≤ x < 79.45
  2. 2. Algebra Expanding two brackets

    Expand: (x + 4)(x - 3)

    Answer: x² + x - 12
  3. 3. Geometry Area of a circle

    Calculate the area of a circle with diameter 14cm

    Answer: 153.94cm²
  4. 4. Ratio One amount as a percentage of another

    Express 56 as a percentage of 140

    Answer: 40%
  5. 5. Statistics Averages and range

    Find the mean, mode, median and range of: 24, 24, 35, 19, 39

    Answer: Mean = 28.2, Mode = 24, Median = 24, Range = 20