Keystones — Lintel
Five GCSE retrieval questions · 17 January 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 6.7 × 104 × 5.2 × 103
Answer: 3.484 × 108 -
2. Algebra Solving monic quadratics
Solve: x² - 10x + 24 = 0
Answer: x = -6 or x = -4 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 9cm, adjacent = 13cm. Calculate the angle
Answer: 34.7° -
4. Ratio Reverse percentages
After a 27% decrease, a value is 289.08. What was the original?
Answer: 396 -
5. Statistics Range
Calculate the range of: 33, 65, 33, 51, 57, 51
Answer: 32