Keystones — Lintel
Five GCSE retrieval questions · 16 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.005 in standard form
Answer: 5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 34.95cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 40cm
Answer: 5:1 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 33, 43, 47, what is the missing number?
Answer: 5