Keystones — Lintel
Five GCSE retrieval questions · 30 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00094
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 39°. Find opposite
Answer: 21.9cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:10
Answer: 6:6:5 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 38, 22, 22, 49, 35, what is the missing number?
Answer: 62