Keystones — Lintel
Five GCSE retrieval questions · 12 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
47000000
Answer: 4.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 32°. Find adjacent side
Answer: 29.7cm -
4. Ratio Mixed ratio problems
Divide 77 in the ratio 4:1:2
Answer: 44, 11 and 22 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 34, 38, 34, 22, 16, what is the missing number?
Answer: 42