Keystones — Lintel
Five GCSE retrieval questions · 5 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.025
Answer: 2.5 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 45°. Find opposite
Answer: 20cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 20, 20, 20, 37, 16, 31, 6, 40
Answer: 23.8