Keystones — Lintel
Five GCSE retrieval questions · 18 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0084 in standard form
Answer: 8.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 60
Answer: (x + 10)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 26.81cm -
4. Ratio Mixed ratio problems
£150.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £50.00 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 20, 31, 39, 17, what is the missing number?
Answer: 18