Keystones — Lintel
Five GCSE retrieval questions · 31 July 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 5.2 × 105 × 7.4 × 104
Answer: 3.85 × 1010 -
2. Algebra Solving monic quadratics
Solve: x² -2x - 8 = 0
Answer: x = 4 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 22cm, hypotenuse = 34cm. Find the angle
Answer: 49.7° -
4. Ratio Reverse percentages
After a 19% decrease, a value is 349.92. What was the original?
Answer: 432 -
5. Statistics Range
Calculate the range of: 37, 86, 107, 71, 53, 91
Answer: 70