Keystones — Lintel
Five GCSE retrieval questions · 1 August 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 9 × 103 × 1 × 104
Answer: 9 × 107 -
2. Algebra Solving monic quadratics
Solve: x² - 9x + 20 = 0
Answer: x = -5 or x = -4 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 17cm, hypotenuse = 35cm. Find the angle
Answer: 60.9° -
4. Ratio Reverse percentages
A price of £787.20 includes a 23% increase. What was the price before the increase?
Answer: £640.00 -
5. Statistics Range
Find the range of: -18, 36, 2, 1, 40
Answer: 58