Keystones — Lintel
Five GCSE retrieval questions · 2 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000011 in standard form
Answer: 1.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.98cm -
4. Ratio Mixed ratio problems
£252.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £72.00 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 37, 35, 29, what is the missing number?
Answer: 55