Keystones — Lintel
Five GCSE retrieval questions · 8 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 2
Answer: (x + 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 20.28cm -
4. Ratio Mixed ratio problems
Simplify: 8:10:4
Answer: 4:5:2 -
5. Statistics Mean
Calculate the mean of: 36, 32, 8, 44, 29, 16, 5, 33. Give your answer to 2 decimal places
Answer: 25.38