Keystones — Lintel
Five GCSE retrieval questions · 22 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
48000
Answer: 4.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 38°. Find opposite
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Divide 250 in the ratio 3:4:3
Answer: 75, 100 and 75 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 48, 43, 21, 19, 43, what is the missing number?
Answer: 36