Keystones — Lintel
Five GCSE retrieval questions · 7 November 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00022
Answer: 2.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 25°. Find adjacent side
Answer: 19cm -
4. Ratio Mixed ratio problems
£182.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £104.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 23, 34, 29, what is the missing number?
Answer: 66