Keystones — Lintel
Five GCSE retrieval questions · 21 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.026 in standard form
Answer: 2.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.73cm -
4. Ratio Mixed ratio problems
£328.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £123.00 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 34, 39, 46, 31, 17, what is the missing number?
Answer: 7