Keystones — Lintel
Five GCSE retrieval questions · 3 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000094 in standard form
Answer: 9.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 19.76cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 500g
Answer: 4:1 -
5. Statistics Mean
Calculate the mean of: 31, 12, 10, 10, 25, 46. Give your answer to 2 decimal places
Answer: 22.33