Keystones — Lintel
Five GCSE retrieval questions · 16 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0024 in standard form
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 13.28cm -
4. Ratio Mixed ratio problems
Simplify: 15:9:6
Answer: 5:3:2 -
5. Statistics Mean
Calculate the mean of: 28, 24, 38, 37, 44, 45, 44, 49. Give your answer to 2 decimal places
Answer: 38.63