Keystones — Lintel
Five GCSE retrieval questions · 12 June 2026 · mathsvault.uk/keystones
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1. Number Multiplying in standard form
Multiply: 7.1 × 105 × 5.1 × 106
Answer: 3.62 × 1012 -
2. Algebra Solving monic quadratics
Solve: x² - 9x + 20 = 0
Answer: x = -4 or x = -5 -
3. Geometry SOHCAHTOA — missing angle
Opposite = 8cm, adjacent = 9cm. Calculate the angle
Answer: 41.6° -
4. Ratio Reverse percentages
A price of £459.34 includes a 19% increase. What was the price before the increase?
Answer: £386.00 -
5. Statistics Range
Find the range of: -30, 34, -24, 12, -14
Answer: 64