Keystones — Lintel
Five GCSE retrieval questions · 17 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 230,000 in standard form
Answer: 2.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 18.31cm -
4. Ratio Mixed ratio problems
£168.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £112.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 49, 33, 37, what is the missing number?
Answer: 33