Keystones — Lintel
Five GCSE retrieval questions · 23 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00097 in standard form
Answer: 9.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 17.88cm -
4. Ratio Mixed ratio problems
Express the first part of 15:14 as a fraction in simplest form
Answer: 15⁄29 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 35, 50, 24, 41, 40, what is the missing number?
Answer: 8