Keystones — Lintel
Five GCSE retrieval questions · 22 February 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
48000
Answer: 4.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 48°. Find opposite
Answer: 18.9cm -
4. Ratio Mixed ratio problems
Divide 261 in the ratio 3:2:4
Answer: 87, 58 and 116 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 21, 30, 21, 49, 47, what is the missing number?
Answer: -36