Keystones — Lintel
Five GCSE retrieval questions · 1 December 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
280000
Answer: 2.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 33°. Find adjacent side
Answer: 22.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 33, 48, 46, 22, what is the missing number?
Answer: 41