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Lintel · Grades 5–7 Keystones #165 14 June 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 14 June 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 9.8 × 103 × 5.5 × 105

    Answer: 5.39 × 109
  2. 2. Algebra Solving monic quadratics

    Solve: x² -3x - 18 = 0

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

    Adjacent = 13cm, hypotenuse = 23cm. Find the angle

    Answer: 55.6°
  4. 4. Ratio Reverse percentages

    After a 20% decrease, a value is 166.4. What was the original?

    Answer: 208
  5. 5. Statistics Range

    Find the range of: -29, 27, 14, -23, -7

    Answer: 56

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