Keystones — Lintel
Five GCSE retrieval questions · 29 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000064 in standard form
Answer: 6.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 20.24cm -
4. Ratio Mixed ratio problems
£259.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £185.00 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 38, 28, 40, 48, 31, what is the missing number?
Answer: 7