Keystones — Lintel
Five GCSE retrieval questions · 23 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,000,000 in standard form
Answer: 9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 44
Answer: (x + 11)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 16.52cm -
4. Ratio Mixed ratio problems
Express the first part of 12:7 as a fraction in simplest form
Answer: 12⁄19 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 48, 20, 27, 46, 44, what is the missing number?
Answer: 43