Keystones — Lintel
Five GCSE retrieval questions · 22 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0029
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 53°. Find opposite
Answer: 13.3cm -
4. Ratio Mixed ratio problems
Simplify: 24:12:16
Answer: 6:3:4 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 24, 43, 41, 23, what is the missing number?
Answer: -1