Keystones — Lintel
Five GCSE retrieval questions · 3 March 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 7.1 × 103 × 2.6 × 103
Answer: 1.846 × 107 -
2. Algebra Solving monic quadratics
Solve: x² - 13x + 42 = 0
Answer: x = -6 or x = -7 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 17cm, adjacent = 18cm. Calculate the angle
Answer: 43.4° -
4. Ratio Reverse percentages
After a 25% decrease, a value is 338.25. What was the original?
Answer: 451 -
5. Statistics Range
Find the range of: -28, -5, 35, 29, 17
Answer: 63