Keystones — Lintel
Five GCSE retrieval questions · 30 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0029 in standard form
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 45°. Find opposite
Answer: 17cm -
4. Ratio Mixed ratio problems
Simplify: 12:10:6
Answer: 6:5:3 -
5. Statistics Mean
Calculate the mean of: 23, 29, 45, 33, 39, 21. Give your answer to 2 decimal places
Answer: 31.67