Keystones — Lintel
Five GCSE retrieval questions · 14 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000,000 in standard form
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 60°. Find adjacent side
Answer: 9.5cm -
4. Ratio Mixed ratio problems
£322.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £230.00 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 39, 25, 22, what is the missing number?
Answer: 30