Keystones — Lintel
Five GCSE retrieval questions · 2 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000031 in standard form
Answer: 3.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x + 9
Answer: (x + 3)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.37cm -
4. Ratio Mixed ratio problems
£230.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £92.00 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 18, 23, 45, 31, what is the missing number?
Answer: 68