Keystones — Lintel
Five GCSE retrieval questions · 10 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000042 in standard form
Answer: 4.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 23.31cm -
4. Ratio Mixed ratio problems
£185.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £74.00 -
5. Statistics Mean
Calculate the mean of: 37, 39, 8, 35, 9, 11, 10. Give your answer to 2 decimal places
Answer: 21.29