Keystones — Lintel
Five GCSE retrieval questions · 7 March 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 5.1 × 107 × 3.6 × 104
Answer: 1.84 × 1012 -
2. Algebra Solving monic quadratics
Solve: x² - 4x + 4 = 0
Answer: x = -2 or x = -2 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 21cm, hypotenuse = 39cm. Find the angle
Answer: 57.4° -
4. Ratio Reverse percentages
A price of £924.75 includes a 35% increase. What was the price before the increase?
Answer: £685.00 -
5. Statistics Range
Calculate the range of: 86, 48, 96, 70, 52, 68
Answer: 48