Keystones — Lintel
Five GCSE retrieval questions · 16 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
46000
Answer: 4.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 47°. Find adjacent side
Answer: 19.cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 3:4:1
Answer: 81, 108 and 27 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 30, 27, 50, what is the missing number?
Answer: 49