Keystones — Lintel
Five GCSE retrieval questions · 30 January 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
19000
Answer: 1.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 60°. Find opposite
Answer: 46.8cm -
4. Ratio Mixed ratio problems
In ratio 2:4:4, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 25, 26, 48, what is the missing number?
Answer: -19