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Lintel · Grades 5–7 Keystones #309 5 November 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 5 November 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 7.3 × 103 × 4.3 × 105

    Answer: 3.139 × 109
  2. 2. Algebra Solving monic quadratics

    Solve: x² - 11x + 28 = 0

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

    Adjacent = 12cm, hypotenuse = 31cm. Find the angle

    Answer: 67.2°
  4. 4. Ratio Reverse percentages

    A price of £810.00 includes a 35% increase. What was the price before the increase?

    Answer: £600.00
  5. 5. Statistics Range

    Find the range of: 36, -19, 9, 3, -18

    Answer: 55

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