Keystones — Lintel
Five GCSE retrieval questions · 14 January 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 3.6 × 105 × 5.6 × 104
Answer: 2.02 × 1010 -
2. Algebra Solving monic quadratics
Solve: x² - 6x + 9 = 0
Answer: x = -3 or x = -3 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 16cm, hypotenuse = 27cm. Find the angle
Answer: 53.7° -
4. Ratio Reverse percentages
After a 17% decrease, a value is 279.71. What was the original?
Answer: 337 -
5. Statistics Range
Calculate the range of: 46, 58, 56, 84, 76, 61
Answer: 38