Keystones — Lintel
Five GCSE retrieval questions · 30 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00085
Answer: 8.5 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 43°. Find opposite
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify: 15:6:6
Answer: 5:2:2 -
5. Statistics Mean
Calculate the mean of: 25, 33, 14, 28, 26, 31, 41
Answer: 28.3