Keystones — Lintel
Five GCSE retrieval questions · 28 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 590,000,000 in standard form
Answer: 5.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 13.12cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 55cm
Answer: 20:11 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 38, 16, 42, 34, 34, what is the missing number?
Answer: 70