Keystones — Lintel
Five GCSE retrieval questions · 20 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 3.4 × 103 × 6.2 × 103
Answer: 2.108 × 107 -
2. Algebra Solving monic quadratics
Solve: x² - 6x + 8 = 0
Answer: x = -4 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 13cm, adjacent = 20cm. Calculate the angle
Answer: 33° -
4. Ratio Reverse percentages
After a 26% decrease, a value is 111. What was the original?
Answer: 150 -
5. Statistics Range
Find the range of: 35, 29, -3, -21, -17
Answer: 56