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Lintel · Grades 5–7 Keystones #65 6 March 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 6 March 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 9.3 × 103 × 8.3 × 104

    Answer: 7.719 × 108
  2. 2. Algebra Solving monic quadratics

    Solve: x² -3x - 28 = 0

    Answer: x = 7 or x = -4
  3. 3. Geometry SOHCAHTOA — missing angle

    Opposite = 11cm, adjacent = 20cm. Calculate the angle

    Answer: 28.8°
  4. 4. Ratio Reverse percentages

    A price of £531.19 includes a 21% increase. What was the price before the increase?

    Answer: £439.00
  5. 5. Statistics Range

    Find the range of: -10, 41, 28, -1, 19

    Answer: 51

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