Keystones — Lintel
Five GCSE retrieval questions · 16 April 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.0023
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 37°. Find opposite
Answer: 13.6cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:15
Answer: 2:6:5 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 21, 26, 50, 45, what is the missing number?
Answer: 8