Keystones — Lintel
Five GCSE retrieval questions · 8 June 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 2.2 × 103 × 4.3 × 104
Answer: 9.46 × 107 -
2. Algebra Solving monic quadratics
Solve: x² - 13x + 42 = 0
Answer: x = -6 or x = -7 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 16cm, adjacent = 14cm. Calculate the angle
Answer: 48.8° -
4. Ratio Reverse percentages
A price of £261.64 includes a 24% increase. What was the price before the increase?
Answer: £211.00 -
5. Statistics Range
Find the range of: 35, 15, 0, 48, -18
Answer: 66