Keystones — Lintel
Five GCSE retrieval questions · 17 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 6.8 × 103 × 5.5 × 103
Answer: 3.74 × 107 -
2. Algebra Solving monic quadratics
Solve: x² -2x - 48 = 0
Answer: x = 8 or x = -6 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 17cm, adjacent = 16cm. Calculate the angle
Answer: 46.7° -
4. Ratio Reverse percentages
After a 25% decrease, a value is 286.5. What was the original?
Answer: 382 -
5. Statistics Range
Find the range of: 13, -16, 0, -10, 29
Answer: 45