Keystones — Lintel
Five GCSE retrieval questions · 13 August 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
300000
Answer: 3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 45°. Find adjacent side
Answer: 14.8cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:15
Answer: 5:4:5 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 44, 35, 42, 26, 29, what is the missing number?
Answer: 40