Keystones — Lintel
Five GCSE retrieval questions · 5 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00061 in standard form
Answer: 6.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.16cm -
4. Ratio Mixed ratio problems
£329.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £188.00 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 50, 30, 43, 17, what is the missing number?
Answer: 30