Keystones — Lintel
Five GCSE retrieval questions · 26 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00079
Answer: 7.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 56°. Find adjacent side
Answer: 9.5cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 2:4:1
Answer: 48, 96 and 24 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 20, 49, 35, what is the missing number?
Answer: 32