Keystones — Lintel
Five GCSE retrieval questions · 14 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00032
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 46°. Find opposite
Answer: 22.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:12
Answer: 3:2:3 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 48, 44, 33, 47, what is the missing number?
Answer: 18