Keystones — Lintel
Five GCSE retrieval questions · 18 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0012 in standard form
Answer: 1.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 29.79cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:15
Answer: 2:5:5 -
5. Statistics Mean
Calculate the mean of: 24, 15, 48, 22, 19, 15, 35, 23. Give your answer to 2 decimal places
Answer: 25.13