Keystones — Lintel
Five GCSE retrieval questions · 10 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0021
Answer: 2.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 33°. Find opposite
Answer: 13cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:12
Answer: 2:1:3 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 20, 47, 22, what is the missing number?
Answer: 27