Keystones — Lintel
Five GCSE retrieval questions · 21 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.056
Answer: 5.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 43°. Find adjacent side
Answer: 21.9cm -
4. Ratio Mixed ratio problems
£100.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £40.00 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 36, 23, 16, 28, 41, what is the missing number?
Answer: 12