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Lintel · Grades 5–7 Keystones #18 18 January 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 18 January 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 1.3 × 105 × 9.4 × 105

    Answer: 1.222 × 1011
  2. 2. Algebra Solving monic quadratics

    Solve: x² - 10x + 21 = 0

    Answer: x = -3 or x = -7
  3. 3. Geometry SOHCAHTOA — missing angle

    Opposite = 20cm, adjacent = 8cm. Calculate the angle

    Answer: 68.2°
  4. 4. Ratio Reverse percentages

    After a 15% decrease, a value is 87.55. What was the original?

    Answer: 103
  5. 5. Statistics Range

    Calculate the range of: 104, 46, 63, 98, 116, 37

    Answer: 79

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