Keystones — Lintel
Five GCSE retrieval questions · 6 November 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 7.9 × 104 × 3.3 × 104
Answer: 2.61 × 109 -
2. Algebra Solving monic quadratics
Solve: x² - 8x + 12 = 0
Answer: x = -6 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 15cm, adjacent = 12cm. Calculate the angle
Answer: 51.3° -
4. Ratio Reverse percentages
A price of £480.13 includes a 33% increase. What was the price before the increase?
Answer: £361.00 -
5. Statistics Range
Find the range of: 19, -16, 25, 16, -15
Answer: 41