Keystones — Lintel
Five GCSE retrieval questions · 25 January 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00039
Answer: 3.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 35°. Find opposite
Answer: 11.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 29, 15, 26, 50, what is the missing number?
Answer: -10