Keystones — Lintel
Five GCSE retrieval questions · 16 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0079
Answer: 7.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 59°. Find adjacent side
Answer: 15.5cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 50, 49, 49, 37, what is the missing number?
Answer: -65