Keystones — Lintel
Five GCSE retrieval questions · 1 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 230,000,000 in standard form
Answer: 2.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 8.69cm -
4. Ratio Mixed ratio problems
£203.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £87.00 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 32, 17, 36, 46, 40, what is the missing number?
Answer: 15