Keystones — Lintel
Five GCSE retrieval questions · 28 May 2026 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.065
Answer: 6.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 38°. Find opposite
Answer: 13.3cm -
4. Ratio Mixed ratio problems
In ratio 2:2:3, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 28, 28, 9, 23, 8, 37
Answer: 22.2