Keystones — Lintel
Five GCSE retrieval questions · 19 February 2026 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.05
Answer: 5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 44°. Find adjacent side
Answer: 11.5cm -
4. Ratio Mixed ratio problems
Divide 208 in the ratio 1:2:1
Answer: 52, 104 and 52 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 30, 38, 31, what is the missing number?
Answer: 61