Keystones — Lintel
Five GCSE retrieval questions · 18 July 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00029
Answer: 2.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 53°. Find adjacent side
Answer: 19.9cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 43, 33, 15, 37, what is the missing number?
Answer: 47