Keystones — Lintel
Five GCSE retrieval questions · 23 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.061 in standard form
Answer: 6.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 36, 16, 17, 27, what is the missing number?
Answer: 29