Keystones — Lintel
Five GCSE retrieval questions · 20 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.035
Answer: 3.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 53°. Find adjacent side
Answer: 20.5cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 4:2:3
Answer: 84, 42 and 63 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 23, 22, 42, 17, 43, what is the missing number?
Answer: -3