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Lintel · Grades 5–7 Keystones #12 12 January 2026 Skills week 3 of 7
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Five GCSE retrieval questions · 12 January 2026 · mathsvault.uk/keystones

  1. 1. Number Multiplying in standard form

    Calculate: 6.4 × 105 × 1.8 × 104

    Answer: 1.152 × 1010
  2. 2. Algebra Solving monic quadratics

    Solve: x² -7x - 8 = 0

    Answer: x = 8 or x = -1
  3. 3. Geometry SOHCAHTOA — missing angle

    Opposite = 14cm, adjacent = 20cm. Calculate the angle

    Answer: 35°
  4. 4. Ratio Reverse percentages

    A price of £404.74 includes a 18% increase. What was the price before the increase?

    Answer: £343.00
  5. 5. Statistics Range

    Calculate the range of: 83, 113, 84, 71, 73, 47

    Answer: 66

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