Keystones — Lintel
Five GCSE retrieval questions · 22 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000069 in standard form
Answer: 6.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 15.65cm -
4. Ratio Mixed ratio problems
£336.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £126.00 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 39, 33, 16, 37, 31, what is the missing number?
Answer: 18