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Lintel · Grades 5–7 Keystones #209 28 July 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 28 July 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Multiply: 8.8 × 104 × 5.5 × 105

    Answer: 4.84 × 1010
  2. 2. Algebra Solving monic quadratics

    Solve: x² -4x - 21 = 0

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

    Opposite = 8cm, adjacent = 16cm. Calculate the angle

    Answer: 26.6°
  4. 4. Ratio Reverse percentages

    After a 27% decrease, a value is 183.23. What was the original?

    Answer: 251
  5. 5. Statistics Range

    Calculate the range of: 34, 38, 57, 21, 38, 38

    Answer: 36

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