Keystones — Lintel
Five GCSE retrieval questions · 19 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 3.3 × 104 × 8.3 × 106
Answer: 2.74 × 1011 -
2. Algebra Solving monic quadratics
Solve: x² - 9x + 14 = 0
Answer: x = -7 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 19cm, hypotenuse = 26cm. Find the angle
Answer: 43° -
4. Ratio Reverse percentages
After a 21% decrease, a value is 224.36. What was the original?
Answer: 284 -
5. Statistics Range
Calculate the range of: 77, 29, 100, 23, 38, 44
Answer: 77