Keystones — Lintel
Five GCSE retrieval questions · 24 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0031 in standard form
Answer: 3.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 10.12cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 900g
Answer: 10:9 -
5. Statistics Mean
Calculate the mean of: 49, 33, 29, 20, 40, 49. Give your answer to 2 decimal places
Answer: 36.67