Keystones — Lintel
Five GCSE retrieval questions · 19 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00031
Answer: 3.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 58°. Find opposite
Answer: 22.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 41, 20, 33, 39, what is the missing number?
Answer: 57