Keystones — Lintel
Five GCSE retrieval questions · 15 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 500,000,000 in standard form
Answer: 5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 17.62cm -
4. Ratio Mixed ratio problems
£147.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £63.00 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 24, 49, 48, what is the missing number?
Answer: 11