Keystones — Lintel
Five GCSE retrieval questions · 13 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.024
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 43°. Find opposite
Answer: 14cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 49, 34, 40, 25, what is the missing number?
Answer: -18