Keystones — Lintel
Five GCSE retrieval questions · 15 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.092
Answer: 9.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 42°. Find opposite
Answer: 21.6cm -
4. Ratio Mixed ratio problems
Simplify: 8:20:16
Answer: 2:5:4 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 37, 16, 21, what is the missing number?
Answer: 74