Keystones — Lintel
Five GCSE retrieval questions · 29 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00075 in standard form
Answer: 7.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.85cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:12
Answer: 5:6:3 -
5. Statistics Mean
Calculate the mean of: 43, 12, 5, 42, 35, 33, 28. Give your answer to 2 decimal places
Answer: 28.29