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Lintel · Grades 5–7 Keystones #308 4 November 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 4 November 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Multiply: 4.1 × 105 × 6 × 105

    Answer: 2.46 × 1011
  2. 2. Algebra Solving monic quadratics

    Solve: x² -x - 20 = 0

    Answer: x = 5 or x = -4
  3. 3. Geometry SOHCAHTOA — missing angle

    Opposite = 14cm, adjacent = 11cm. Calculate the angle

    Answer: 51.8°
  4. 4. Ratio Reverse percentages

    A price of £875.96 includes a 22% increase. What was the price before the increase?

    Answer: £718.00
  5. 5. Statistics Range

    Calculate the range of: 112, 95, 35, 39, 61, 90

    Answer: 77

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