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Lintel · Grades 5–7 Keystones #261 18 September 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 18 September 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 5.5 × 105 × 5.4 × 105

    Answer: 2.97 × 1011
  2. 2. Algebra Solving monic quadratics

    Solve: x² -x - 12 = 0

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

    Opposite = 13cm, adjacent = 16cm. Calculate the angle

    Answer: 39.1°
  4. 4. Ratio Reverse percentages

    After a 15% decrease, a value is 136. What was the original?

    Answer: 160
  5. 5. Statistics Range

    Find the range of: 1, 38, 47, -12, 29

    Answer: 59

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