Keystones — Lintel
Five GCSE retrieval questions · 1 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
5100000
Answer: 5.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 39°. Find opposite
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Divide 261 in the ratio 4:1:4
Answer: 116, 29 and 116 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 22, 19, 50, 37, what is the missing number?
Answer: 2