Keystones — Lintel
Five GCSE retrieval questions · 17 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.087 in standard form
Answer: 8.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 17.79cm -
4. Ratio Mixed ratio problems
£115.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £69.00 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 20, 38, 33, what is the missing number?
Answer: 65