Keystones — Lintel
Five GCSE retrieval questions · 7 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000013 in standard form
Answer: 1.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 24
Answer: (x + 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 13.43cm -
4. Ratio Mixed ratio problems
Simplify: 6:4:8
Answer: 3:2:4 -
5. Statistics Mean
Calculate the mean of: 37, 42, 45, 31, 32, 9, 12. Give your answer to 2 decimal places
Answer: 29.71