Keystones — Lintel
Five GCSE retrieval questions · 3 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.003 in standard form
Answer: 3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 11.04cm -
4. Ratio Mixed ratio problems
Simplify: 8:10:6
Answer: 4:5:3 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 20, 49, 49, 40, what is the missing number?
Answer: 32