Keystones — Lintel
Five GCSE retrieval questions · 12 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.99cm -
4. Ratio Mixed ratio problems
£175.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £105.00 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 41, 18, 49, 19, what is the missing number?
Answer: 63