Keystones — Lintel
Five GCSE retrieval questions · 19 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.01
Answer: 1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 35°. Find adjacent side
Answer: 15.6cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 1:2:4
Answer: 15, 30 and 60 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 50, 28, 48, 38, what is the missing number?
Answer: -34