Keystones — Lintel
Five GCSE retrieval questions · 5 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.044
Answer: 4.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 60°. Find opposite
Answer: 50.2cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:20
Answer: 2:6:5 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 20, 27, 20, 47, 23, what is the missing number?
Answer: 85