Keystones — Lintel
Five GCSE retrieval questions · 16 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0007
Answer: 7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 32°. Find opposite
Answer: 10.6cm -
4. Ratio Mixed ratio problems
In ratio 1:3:4, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 16, 38, 24, 21, what is the missing number?
Answer: 71