Keystones — Lintel
Five GCSE retrieval questions · 26 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
72000000
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 39°. Find adjacent side
Answer: 25.6cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:18
Answer: 5:4:6 -
5. Statistics Mean
Calculate the mean of: 21, 32, 17, 26, 23, 18
Answer: 22.8