Keystones — Lintel
Five GCSE retrieval questions · 2 August 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 5.4 × 104 × 6.9 × 104
Answer: 3.73 × 109 -
2. Algebra Solving monic quadratics
Solve: x² -5x - 24 = 0
Answer: x = 8 or x = -3 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 15cm, adjacent = 16cm. Calculate the angle
Answer: 43.2° -
4. Ratio Reverse percentages
A price of £341.76 includes a 28% increase. What was the price before the increase?
Answer: £267.00 -
5. Statistics Range
Find the range of: 35, -12, -20, -1, 40
Answer: 60