Keystones — Lintel
Five GCSE retrieval questions · 20 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 360,000 in standard form
Answer: 3.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 12.82cm -
4. Ratio Mixed ratio problems
£315.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £140.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 34, 49, 25, what is the missing number?
Answer: 44