Keystones — Lintel
Five GCSE retrieval questions · 24 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0015 in standard form
Answer: 1.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 16.74cm -
4. Ratio Mixed ratio problems
Divide 240 in the ratio 2:2:1
Answer: 96, 96 and 48 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 31, 49, 21, 18, 20, what is the missing number?
Answer: 41