Keystones — Lintel
Five GCSE retrieval questions · 30 July 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Calculate: 7.4 × 105 × 4 × 105
Answer: 2.96 × 1011 -
2. Algebra Solving monic quadratics
Solve: x² - 6x + 8 = 0
Answer: x = -4 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 8cm, adjacent = 13cm. Calculate the angle
Answer: 31.6° -
4. Ratio Reverse percentages
After a 29% decrease, a value is 336.54. What was the original?
Answer: 474 -
5. Statistics Range
Find the range of: 29, -3, 37, -21, 25
Answer: 58