Keystones — Lintel
Five GCSE retrieval questions · 14 July 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
34000
Answer: 3.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 59°. Find opposite
Answer: 33.3cm -
4. Ratio Mixed ratio problems
Divide 132 in the ratio 2:1:3
Answer: 44, 22 and 66 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 31, 40, 30, what is the missing number?
Answer: 35