Keystones — Lintel
Five GCSE retrieval questions · 20 April 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 2.5 × 107 × 7.2 × 105
Answer: 1.8 × 1013 -
2. Algebra Solving monic quadratics
Solve: x² -5x - 14 = 0
Answer: x = 7 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 23cm, hypotenuse = 32cm. Find the angle
Answer: 44° -
4. Ratio Reverse percentages
After a 20% decrease, a value is 176.8. What was the original?
Answer: 221 -
5. Statistics Range
Find the range of: -3, 29, -23, 23, 31
Answer: 54