Keystones — Lintel
Five GCSE retrieval questions · 7 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 14,000 in standard form
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 23.01cm -
4. Ratio Mixed ratio problems
Simplify: 4:6:6
Answer: 2:3:3 -
5. Statistics Mean
Calculate the mean of: 9, 8, 18, 9, 19, 17, 40, 49. Give your answer to 2 decimal places
Answer: 21.13