Keystones — Lintel
Five GCSE retrieval questions · 29 July 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 9.8 × 104 × 8.4 × 105
Answer: 8.232 × 1010 -
2. Algebra Solving monic quadratics
Solve: x² - 8x + 15 = 0
Answer: x = -5 or x = -3 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 14cm, hypotenuse = 25cm. Find the angle
Answer: 55.9° -
4. Ratio Reverse percentages
After a 19% decrease, a value is 256.77. What was the original?
Answer: 317 -
5. Statistics Range
Find the range of: 18, 30, 41, -27, 3
Answer: 68