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Lintel · Grades 5–7 Keystones #164 13 June 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 13 June 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 8.3 × 103 × 2 × 105

    Answer: 1.66 × 109
  2. 2. Algebra Solving monic quadratics

    Solve: x² -4x - 12 = 0

    Answer: x = 6 or x = -2
  3. 3. Geometry SOHCAHTOA — missing angle

    Adjacent = 15cm, hypotenuse = 24cm. Find the angle

    Answer: 51.3°
  4. 4. Ratio Reverse percentages

    A price of £644.80 includes a 24% increase. What was the price before the increase?

    Answer: £520.00
  5. 5. Statistics Range

    Calculate the range of: 43, 106, 90, 100, 84, 90

    Answer: 63

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