Keystones — Lintel
Five GCSE retrieval questions · 22 August 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.0035
Answer: 3.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 48°. Find opposite
Answer: 14.4cm -
4. Ratio Mixed ratio problems
In ratio 4:2:1, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 38, 36, 30, 18, what is the missing number?
Answer: 3