Keystones — Lintel
Five GCSE retrieval questions · 1 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 51,000,000 in standard form
Answer: 5.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 45°. Find opposite
Answer: 23cm -
4. Ratio Mixed ratio problems
£270.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £180.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 38, 40, 24, what is the missing number?
Answer: 50