Keystones — Lintel
Five GCSE retrieval questions · 3 November 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 6.5 × 106 × 9 × 104
Answer: 5.85 × 1011 -
2. Algebra Solving monic quadratics
Solve: x² - 11x + 30 = 0
Answer: x = -5 or x = -6 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 20cm, adjacent = 19cm. Calculate the angle
Answer: 46.5° -
4. Ratio Reverse percentages
After a 23% decrease, a value is 178.64. What was the original?
Answer: 232 -
5. Statistics Range
Find the range of: 39, -5, 40, -26, 48
Answer: 74