Keystones — Lintel
Five GCSE retrieval questions · 15 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
170000
Answer: 1.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 55°. Find opposite
Answer: 37.cm -
4. Ratio Mixed ratio problems
Divide 119 in the ratio 1:2:4
Answer: 17, 34 and 68 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 37, 50, 15, 39, what is the missing number?
Answer: 4