Keystones — Lintel
Five GCSE retrieval questions · 2 November 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 1.1 × 104 × 3.2 × 103
Answer: 3.52 × 107 -
2. Algebra Solving monic quadratics
Solve: x² - 7x + 12 = 0
Answer: x = -4 or x = -3 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 22cm, hypotenuse = 38cm. Find the angle
Answer: 54.6° -
4. Ratio Reverse percentages
After a 25% decrease, a value is 90.75. What was the original?
Answer: 121 -
5. Statistics Range
Calculate the range of: 27, 22, 47, 49, 70, 21
Answer: 49