Keystones — Lintel
Five GCSE retrieval questions · 21 September 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
84000000
Answer: 8.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 26°. Find adjacent side
Answer: 35.cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:20
Answer: 4:2:5 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 17, 28, 23, 24, 41, what is the missing number?
Answer: 77