Keystones — Lintel
Five GCSE retrieval questions · 6 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 23,000,000 in standard form
Answer: 2.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15cm -
4. Ratio Mixed ratio problems
£189.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £54.00 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 24, 41, 46, 40, what is the missing number?
Answer: 14