Keystones — Lintel
Five GCSE retrieval questions · 27 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0071 in standard form
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.07cm -
4. Ratio Mixed ratio problems
£120.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £80.00 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 37, 41, 20, 32, 20, what is the missing number?
Answer: 48