Keystones — Lintel
Five GCSE retrieval questions · 2 March 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 9.3 × 106 × 2.7 × 104
Answer: 2.51 × 1011 -
2. Algebra Solving monic quadratics
Solve: x² -x - 2 = 0
Answer: x = 2 or x = -1 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 23cm, hypotenuse = 32cm. Find the angle
Answer: 44° -
4. Ratio Reverse percentages
After a 29% decrease, a value is 84.49. What was the original?
Answer: 119 -
5. Statistics Range
Calculate the range of: 66, 88, 96, 21, 28, 85
Answer: 75