Keystones — Lintel
Five GCSE retrieval questions · 15 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 7.3 × 105 × 6.7 × 103
Answer: 4.891 × 109 -
2. Algebra Solving monic quadratics
Solve: x² - 11x + 30 = 0
Answer: x = -6 or x = -5 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 11cm, adjacent = 20cm. Calculate the angle
Answer: 28.8° -
4. Ratio Reverse percentages
After a 26% decrease, a value is 230.14. What was the original?
Answer: 311 -
5. Statistics Range
Calculate the range of: 37, 31, 58, 63, 57, 41
Answer: 32