Keystones — Lintel
Five GCSE retrieval questions · 9 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000051 in standard form
Answer: 5.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.79cm -
4. Ratio Mixed ratio problems
Express the second part of 11:9 as a fraction in simplest form
Answer: 9⁄20 -
5. Statistics Mean
Calculate the mean of: 43, 7, 11, 38, 42, 46, 10, 28. Give your answer to 2 decimal places
Answer: 28.13