Keystones — Lintel
Five GCSE retrieval questions · 1 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0076
Answer: 7.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 56°. Find opposite
Answer: 31.cm -
4. Ratio Mixed ratio problems
In ratio 3:4:1, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 37, 35, 33, what is the missing number?
Answer: 7