Keystones — Lintel
Five GCSE retrieval questions · 22 April 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 6 × 106 × 2.2 × 105
Answer: 1.32 × 1012 -
2. Algebra Solving monic quadratics
Solve: x² - 9x + 14 = 0
Answer: x = -7 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 29cm, hypotenuse = 34cm. Find the angle
Answer: 31.5° -
4. Ratio Reverse percentages
After a 20% decrease, a value is 301.6. What was the original?
Answer: 377 -
5. Statistics Range
Calculate the range of: 22, 79, 77, 55, 27, 75
Answer: 57