Keystones — Lintel
Five GCSE retrieval questions · 9 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00049 in standard form
Answer: 4.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 36
Answer: (x + 9)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 45°. Find opposite
Answer: 21cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:4
Answer: 1:3:1 -
5. Statistics Mean
Calculate the mean of: 39, 45, 38, 38, 32, 9, 21. Give your answer to 2 decimal places
Answer: 31.71