Keystones — Lintel
Five GCSE retrieval questions · 24 April 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 9.2 × 103 × 1.5 × 103
Answer: 1.38 × 107 -
2. Algebra Solving monic quadratics
Solve: x² + 3x - 18 = 0
Answer: x = 3 or x = -6 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 11cm, adjacent = 13cm. Calculate the angle
Answer: 40.2° -
4. Ratio Reverse percentages
A price of £481.12 includes a 24% increase. What was the price before the increase?
Answer: £388.00 -
5. Statistics Range
Calculate the range of: 54, 50, 30, 56, 35, 100
Answer: 70