Keystones — Lintel
Five GCSE retrieval questions · 8 September 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
16000000
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 58°. Find opposite
Answer: 19.2cm -
4. Ratio Mixed ratio problems
£168.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £56.00 -
5. Statistics Mean
Calculate the mean of: 38, 14, 18, 33, 46, 9, 20
Answer: 25.4