Keystones — Lintel
Five GCSE retrieval questions · 13 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0052 in standard form
Answer: 5.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 39.99cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:6
Answer: 3:5:3 -
5. Statistics Mean
Calculate the mean of: 21, 20, 7, 11, 20, 46, 21. Give your answer to 2 decimal places
Answer: 20.86