Keystones — Lintel
Five GCSE retrieval questions · 9 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
11000000
Answer: 1.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 30°. Find adjacent side
Answer: 34.6cm -
4. Ratio Mixed ratio problems
Divide 176 in the ratio 3:1:4
Answer: 66, 22 and 88 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 44, 39, 37, 16, what is the missing number?
Answer: 59