Keystones — Lintel
Five GCSE retrieval questions · 31 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
950000
Answer: 9.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 37°. Find opposite
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:15:18
Answer: 4:5:6 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 40, 31, 17, 27, what is the missing number?
Answer: 15