Keystones — Lintel
Five GCSE retrieval questions · 14 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 5.6 × 107 × 6.6 × 106
Answer: 3.7 × 1014 -
2. Algebra Solving monic quadratics
Solve: x² + 0x - 25 = 0
Answer: x = 5 or x = -5 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 21cm, hypotenuse = 38cm. Find the angle
Answer: 56.5° -
4. Ratio Reverse percentages
After a 15% decrease, a value is 358.7. What was the original?
Answer: 422 -
5. Statistics Range
Find the range of: 31, 4, 27, 45, -16
Answer: 61