Keystones — Lintel
Five GCSE retrieval questions · 2 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.054
Answer: 5.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 40°. Find adjacent side
Answer: 19.2cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 2:4:3
Answer: 28, 56 and 42 -
5. Statistics Mean
Calculate the mean of: 37, 7, 42, 25, 23, 17, 34, 23
Answer: 26