Keystones — Lintel
Five GCSE retrieval questions · 10 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 930,000,000 in standard form
Answer: 9.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 37.16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 80cm
Answer: 35:4 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 21, 48, 31, 49, 49, what is the missing number?
Answer: 6