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Lintel · Grades 5–7 Keystones #15 15 January 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 15 January 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 3.8 × 105 × 9 × 105

    Answer: 3.42 × 1011
  2. 2. Algebra Solving monic quadratics

    Solve: x² -x - 30 = 0

    Answer: x = 6 or x = -5
  3. 3. Geometry SOHCAHTOA — missing angle

    Opposite = 13cm, adjacent = 9cm. Calculate the angle

    Answer: 55.3°
  4. 4. Ratio Reverse percentages

    After a 21% decrease, a value is 193.55. What was the original?

    Answer: 245
  5. 5. Statistics Range

    Find the range of: -25, -21, 17, 23, -2

    Answer: 48

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