Keystones — Lintel
Five GCSE retrieval questions · 31 October 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
83000000
Answer: 8.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 48°. Find opposite
Answer: 23.3cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
Calculate the mean of: 20, 22, 25, 11, 9, 30, 50, 42
Answer: 26.1