Keystones — Lintel
Five GCSE retrieval questions · 27 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0026 in standard form
Answer: 2.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 28.76cm -
4. Ratio Mixed ratio problems
Express the second part of 10:11 as a fraction in simplest form
Answer: 11⁄21 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 26, 17, 18, what is the missing number?
Answer: 27